All learned men say that the five elements, eternal time, fruitive activity, the three modes of material nature, and the varieties produced by these modes are all creations of yogamāyā. This material world is therefore extremely difficult to understand, but those who are highly learned have rejected it. May the Supreme Personality of Godhead, who is the controller of everything, be pleased with us.
(Srimad Bhagavatam----8:5:43----purport).

Demons sometimes declare to a devotee that they cannot accept the existence of God because they cannot see Him. But what the demon does not know is stated by the Lord Himself in Bhagavad-gītā (7.25): nāhaṁ prakāśaḥ sarvasya yogamāyā-samāvṛtaḥ. "I am never manifest to the foolish and unintelligent. For them I am covered by yogamāyā." The Lord is open to being seen by devotees, but nondevotees cannot see Him.
(Srimad Bhagavatam----7:8:12----purport).

Although the Pāṇḍavas, because of the influence of Kṛṣṇa's yogamāyā, could not think of their fortunate position, every saintly person, including the great sage Nārada, could understand it, and therefore they constantly visited Mahārāja Yudhiṣṭhira.
(Srimad Bhagavatam----7:10:48----purport).

The Supreme Personality of Godhead can be seen or unseen according to His own transcendental desire; similarly, a devotee, being jīvan-mukta, can be seen or not, as he chooses. As stated in Bhagavad-gītā, nāhaṁ prakāśaḥ sarvasya yogamāyā-samāvṛtaḥ: (B.G.7:25) the Supreme Personality of Godhead, Kṛṣṇa, is not manifest to everyone and anyone. To the common man He is unseen. Ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ: (CC.2:17:136) (Brs. 1.2.234) Kṛṣṇa and His name, fame, qualities and paraphernalia cannot be materially understood. Unless one is advanced in spiritual life (sevonmukhe hi jihvādau), one cannot see Kṛṣṇa. Therefore the ability to see Kṛṣṇa depends on Kṛṣṇa's mercy.
(Srimad Bhagavatam----9:13:11----purport).

By the will of Lord Kṛṣṇa, Anantadeva would appear first, as Balarāma, and Kṛṣṇa's potency, yogamāyā, would also appear. Brahmā informed mother earth about all this, and then he returned to his own abode.
(Srimad Bhagavatam----10:1--summary).

In the Vedas it is said that the potencies of the Supreme Personality of Godhead are called by different names, such as yogamāyā and mahāmāyā. Ultimately, however, the Lord's potency is one, exactly as electric potency is one although it can act both to cool and to heat. The Lord's potency acts in both the spiritual and material worlds. In the spiritual world the Lord's potency works as yogamāyā, and in the material world the same potency works as mahāmāyā, exactly as electricity works in both a heater and a cooler.
(Srimad Bhagavatam----10:1:25----purport).

When the Lord appeared, His potency came with Him and acted in different ways. She acted as yogamāyā with Yaśodā, Devakī and other intimate relations of the Lord, and she acted in a different way with Kaṁsa, Śālva and other asuras. By the order of Lord Kṛṣṇa, His potency yogamāyā came with Him and exhibited different activities according to the time and circumstances. Kāryārthe sambhaviṣyati. Yogamāyā acted differently to execute different purposes desired by the Lord. As confirmed in Bhagavad-gītā (9.13), mahātmānas tu māṁ pārtha daivīṁ prakṛtim āśritāḥ. The mahātmās, who fully surrender to the lotus feet of the Lord, are directed by yogamāyā, whereas the durātmās, those who are devoid of devotional service, are directed by mahāmāyā.
(Srimad Bhagavatam----10:1:25----purport).

Māyā-manuṣyasya (10.1.17). Because of being covered by yogamāyā (nāhaṁ prakāśaḥ sarvasya yogamāyā-samāvṛtaḥ (B.G.7:25), Kṛṣṇa is sometimes called māyā-manuṣya, indicating that although He is the Supreme Personality of Godhead, He appears like an ordinary person. A misunderstanding arises because yogamāyā covers the vision of the general public.
(Srimad Bhagavatam----10:1:69----purport).

The Lord is the Supreme Person, Puruṣottama, but because we are deluded by yogamāyā, He appears to be an ordinary person. Ultimately, however, yogamāyāinduces even a nondevotee to understand the Lord as the Supreme Person, Puruṣottama.
(Srimad Bhagavatam----10:1:69----purport).

Māyā is fully under the control of Viṣṇu. Because the material potency and yogamāyā mingle in the Lord's appearance, they are described as ekānaṁśā. Sometimes ekānaṁśā is interpreted to mean "without differentiation."
(Srimad Bhagavatam----10:1:69----purport).

The word kāryārthe refers to one who attracted the pregnancy of Devakī and bewildered mother Yaśodā. These pastimes are very confidential. The Supreme Personality of Godhead ordered yogamāyā to bewilder His associates in His pastimes and bewilder demons like Kaṁsa. As stated previously, yogamāyāṁ samādiśat. To give service to the Lord, yogamāyā appeared along with mahāmāyā. Mahāmāyā refers to yayā sammohitaṁ jagat, "one who bewilders the entire material world." From this statement it is to be understood that yogamāyā, in her partial expansion, becomes mahāmāyā and bewilders the conditioned souls. In other words, the entire creation has two divisions-transcendental, or spiritual, and material. Yogamāyā manages the spiritual world, and by her partial expansion as mahāmāyā she manages the material world.
(Srimad Bhagavatam----10:1:69----purport).

As stated in the Nārada-pañcarātra, mahāmāyā is a partial expansion of yogamāyā. The Nārada-pañcarātra clearly states that the Supreme Personality has one potency, which is sometimes described as Durgā. The Brahma-saṁhitā says, chāyeva yasya bhuvanāni bibharti durgā (Bs. 5.44). Durgā is not different from yogamāyā. When one understands Durgā properly, he is immediately liberated, for Durgā is originally the spiritual potency, hlādinī-śakti, by whose mercy one can understand the Supreme Personality of Godhead very easily. Rādhā kṛṣṇa-praṇaya-vikṛtir hlādinī-śaktir asmād (CC.1:1:5). The mahāmāyā-śakti, however, is a covering of yogamāyā, and she is therefore called the covering potency. By this covering potency, the entire material world is bewildered (yayā sammohitaṁ jagat). In conclusion, bewildering the conditioned souls and liberating the devotees are both functions belonging to yogamāyā.
(Srimad Bhagavatam----10:1:69----purport).

Transferring the pregnancy of Devakī and keeping mother Yaśodā in deep sleep were both done by yogamāyā; mahāmāyā cannot act upon such devotees, for they are always liberated. But although it is not possible for mahāmāyā to control liberated souls or the Supreme Personality of Godhead, she did bewilder Kaṁsa. The action of yogamāyā in presenting herself before Kaṁsa was the action of mahāmāyā, not yogamāyā. Yogamāyā cannot even see or touch such polluted persons as Kaṁsa. In Caṇḍī, in the Mārkaṇḍeya Purāṇa, Eleventh Chapter, Mahāmāyā says, "During the twenty-eighth yuga in the period of Vaivasvata Manu, I shall take birth as the daughter of Yaśodā and be known as Vindhyācala-vāsinī."
(Srimad Bhagavatam----10:1:69----purport).

The distinction between the two māyās-yogamāyā and mahā-māyā-is described as follows. Kṛṣṇa's rāsa-līlā with the gopīs and the gopīs' bewilderment in respect to their husbands, fathers-in-law and other such relatives were arrangements of yogamāyā in which mahāmāyā had no influence. The Bhāgavatam gives sufficient evidence of this when it clearly says, yogamāyām upāśritaḥ. On the other hand, there were asuras headed by Śālva and kṣatriyas like Duryodhana who were bereft of devotional service in spite of seeing Kṛṣṇa's carrier Garuḍa and the universal form, and who could not understand Kṛṣṇa to be the Supreme Personality of Godhead. This was also bewilderment, but this bewilderment was due to mahāmāyā. Therefore it is to be concluded that the māyā which drags a person from the Supreme Personality of Godhead is called jaḍamāyā, and the māyā which acts on the transcendental platform is called yogamāyā. When Nanda Mahārāja was taken away by Varuṇa, he saw Kṛṣṇa's opulence, but nonetheless he thought of Kṛṣṇa as his son. Such feelings of parental love in the spiritual world are acts of yogamāyā, not of jaḍamāyā, or mahāmāyā. This is the opinion of Śrīla Viśvanātha Cakravartī Ṭhākura.
(Srimad Bhagavatam----10:1:69----purport).

After Kaṁsa killed the ṣaḍ-garbhas, the six sons of Devakī, one after another, Anantadeva entered Devakī's womb and was transferred to the womb of Rohiṇī by the manipulation of Yogamāyā, who was following the order of the Supreme Personality of Godhead. The Lord Himself, who was soon to appear as the eighth son of Devakī, ordered Yogamāyāto take birth from the womb of Yaśodādevī. Because Kṛṣṇa and His potency, Yogamāyā, appeared simultaneously as brother and sister, the world is full of Vaiṣṇavas and śāktas, and there is certainly some rivalry between them. Vaiṣṇavas worship the Supreme Lord, whereas śāktas, according to their desires, worship Yogamāyā in forms like Durgā, Bhadrakālī and Caṇḍikā. Following the orders of the Supreme Personality of Godhead, Yogamāyā transferred Baladeva, Saṅkarṣaṇa, the seventh child of Devakī, from the womb of Devakī to the womb of Rohiṇī.
(Srimad Bhagavatam----10:2--summary).

After Yogamāyā transferred the seventh child of Devakī to the womb of Rohiṇī, the Supreme Personality of Godhead appeared within the heart of Vasudeva and transferred Himself into the heart of Devakī. Because the Lord was present in her heart, Devakī, as her pregnancy continued, appeared effulgent. Upon seeing this effulgence, Kaṁsa was full of anxiety, but he could not harm Devakī because of their family relationship. Thus he began indirectly thinking of Kṛṣṇa and became fully Kṛṣṇa conscious.
(Srimad Bhagavatam----10:2--summary).

The Lord's purpose in maintaining this material world is to give everyone a chance to go back home, back to Godhead, but kings and political leaders unfortunately try to hinder the purpose of the Lord, and therefore the Lord appears, either personally or with His plenary portions, to set things right. It is therefore said:
garbhaṁ sañcārya rohiṇyāṁ
devakyā yogamāyayā
tasyāḥ kukṣiṁ gataḥ kṛṣṇo
dvitīyo vibudhaiḥ stutaḥ
"Kṛṣṇa appeared in the womb of Devakī after transferring Baladeva to the womb of Rohiṇī by the power of Yogamāyā."
(Srimad Bhagavatam----10:2:1-2-----purport).

Yogamāyā is the spiritual potency of the Lord. Out of affection for His devotees, the Lord always stays in spiritual touch with them, although otherwise His māyā potency is so strong that she bewilders even exalted demigods like Brahmā. Therefore the Lord's potency is called yogamāyā. Since the Lord is Viśvātmā, He immediately orderedYogamāyā to give protection to Devakī.
(Srimad Bhagavatam----10:2:6-----purport).

Nanda-gokula, the residence of King Nanda, was itself very beautiful, and when Yogamāyā was ordered to go there and encourage the devotees with fearlessness, it became even more beautiful and safe. Because Yogamāyā had the ability to create such an atmosphere, the Lord ordered her to go to Nanda-gokula.
(Srimad Bhagavatam----10:2:7-----purport).

The first plenary expansion of Kṛṣṇa is Baladeva, also known as Śeṣa. The Śeṣa incarnation of the Supreme Personality of Godhead supports the entire universe, and the eternal mother of this incarnation is mother Rohiṇī. "Because I am going into the womb of Devakī," the Lord told Yogamāyā, "the Śeṣa incarnation has already gone there and made suitable arrangements so that I may live there. Now He should enter the womb of Rohiṇī, His eternal mother."
(Srimad Bhagavatam----10:2:8-----purport).

In regard to Lord Kṛṣṇa's appearance in the womb of Devakī, Brahmā played a part also because on the bank of the milk ocean he requested the Supreme Personality of Godhead to appear. A part was also played by Baladeva, the first expansion of Godhead. Similarly, Yogamāyā, who appeared as the daughter of mother Yaśodā, also played a part. Thus jīva-tattva, viṣṇu-tattva and śakti-tattva are all integrated with the Supreme Personality of Godhead, and when Kṛṣṇa appears, He appears with all His integrated parts.
(Srimad Bhagavatam----10:2:9-----purport).

As explained in previous verses, Yogamāyā was requested to attract Saṅkarṣaṇa, Baladeva, from the womb of Devakī to the womb of Rohiṇī, and this was a very heavy task for her. Yogamāyā naturally could not see how it was possible for her to attract Saṅkarṣaṇa. Therefore Kṛṣṇa addressed her as śubhe, auspicious, and said, "Be blessed. Take power from Me, and you will be able to do it."
(Srimad Bhagavatam----10:2:9-----purport).

By the grace of the Supreme Personality of Godhead, anyone can do anything, for the Lord is present in everything, all things being His parts and parcels (aṁśa-bhāgena) and increasing or decreasing by His supreme will. Balarāma was only fifteen days older than Kṛṣṇa. By the blessings of Kṛṣṇa, Yogamāyā became the daughter of mother Yaśodā, but by the supreme will she was not able to enjoy the parental love of her father and mother. Kṛṣṇa, however, although not actually born from the womb of mother Yaśodā, enjoyed the parental love of mother Yaśodā and Nanda. By the blessings of Kṛṣṇa, Yogamāyā was able to achieve the reputation of being the daughter of mother Yaśodā, who also became famous by the blessings of Kṛṣṇa. Yaśodā means "one who gives fame."
(Srimad Bhagavatam----10:2:9-----purport).

A human being should actually be interested in understanding ātma-tattva, the truth of ātmā, the spirit soul, and Paramātmā, the supreme soul. Those who are interested in ātma-tattva worship the Supreme Personality of Godhead (yasmin vijñāte sarvam evaṁ vijñātaṁ bhavati) (Muṇḍaka Upaniṣad 1.3). However, as explained in the next verse of this chapter, those who cannot understand ātma-tattva (apaśyatām ātma-tattvam) worship Yogamāyā in her different features.
(Srimad Bhagavatam----10:2:10-----purport).

After receiving the orders of the Supreme Personality of Godhead, Yogamāyā twice confirmed her acceptance by saying, "Yes, sir, I shall do as You order," and then saying oṁ. Śrīla Viśvanātha Cakravartī Ṭhākura comments that oṁ signifies Vedic confirmation. Thus Yogamāyā very faithfully received the Lord's order as a Vedic injunction. It is a fact that whatever is spoken by the Supreme Personality of Godhead is a Vedic injunction that no one should neglect.
(Srimad Bhagavatam----10:2:14-----purport).

The real story of what happened after Yogamāyā attracted the child of Devakī into the womb of Rohiṇī in the seventh month of Rohiṇī's pregnancy is described as follows in the Hari-vaṁśa. At midnight, while Rohiṇī was deeply sleeping, she experienced, as if in a dream, that she had undergone a miscarriage. After some time, when she awoke, she saw that this had indeed happened, and she was in great anxiety. But Yogamāyā then informed her, "O auspicious lady, your child is now being replaced. I am attracting a child from the womb of Devakī, and therefore your child will be known as Saṅkarṣaṇa."
(Srimad Bhagavatam----10:2:15-----purport).

The word yoga-nidrā is significant. When one is spiritually reconnected through self-realization, one regards his material life as having been like a dream. As stated in Bhagavad-gītā (2.69):
yā niśā sarva-bhūtānāṁ
tasyāṁ jāgarti saṁyamī
yasyāṁ jāgrati bhūtāni
sā niśā paśyato muneḥ
"What is night for all beings is the time of awakening for the self-controlled; and the time of awakening for all beings is night for the introspective sage." The stage of self-realization is called yoga-nidrā. All material activities appear to be a dream when one is spiritually awakened. Thus yoga-nidrā may be explained to be Yogamāyā.
(Srimad Bhagavatam----10:2:15-----purport).

In other words, the Supreme Personality of Godhead, Kṛṣṇa, cannot be understood by the nondevotees because there is a curtain of yogamāyā which covers Kṛṣṇa's actual features. As confirmed in the Bhagavad-gītā (7.25), nāhaṁ prakāśaḥ sarvasya. The Lord says, "I am not exposed to anyone and everyone."
(Srimad Bhagavatam----10:2:35-----purport).

The Lord then decided to leave the residence of Vasudeva and Devakī, in the prison house of Kaṁsa, and at this very time, Yogamāyā took birth as the daughter of Yaśodā. By the arrangement of Yogamāyā, Vasudeva was able to leave the prison house and save the child from the hands of Kaṁsa. When Vasudeva brought Kṛṣṇa to the house of Nanda Mahārāja, he saw that by Yogamāyā's arrangement, Yaśodā, as well as everyone else, was deeply asleep. Thus he exchanged the babies, taking Yogamāyā from Yaśodā's lap and placing Kṛṣṇa there instead. Then Vasudeva returned to his own place, having taken Yogamāyā as his daughter. He placed Yogamāyā on Devakī's bed and prepared to be a prisoner as before. In Gokula, Yaśodā could not understand whether she had given birth to a male or a female child.
(Srimad Bhagavatam----10:3--summary).

Śrīla Viśvanātha Cakravartī Ṭhākura discusses that Kṛṣṇa appeared simultaneously as the son of Devakī and as the son of Yaśodā, along with the spiritual energyYogamāyā. As the son of Devakī, He first appeared as Viṣṇu, and because Vasudeva was not in the position of pure affection for Kṛṣṇa, Vasudeva worshiped his son as Lord Viṣṇu. Yaśodā, however, pleased her son Kṛṣṇa without understanding His Godhood. This is the difference between Kṛṣṇa as the son of Yaśodā and as the son of Devakī. This is explained by Viśvanātha Cakravartī on the authority of Hari-vaṁśa.
(Srimad Bhagavatam----10:3:47-----purport).

Vasudeva knew very well that as soon as the daughter was in the prison house of Kaṁsa, Kaṁsa would immediately kill her; but to protect his own child, he had to kill the child of his friend. Nanda Mahārāja was his friend, but out of deep affection and attachment for his own son, he knowingly did this. Śrīla Viśvanātha Cakravartī Ṭhākura says that one cannot be blamed for protecting one's own child at the sacrifice of another's. Furthermore, Vasudeva cannot be accused of callousness, since his actions were impelled by the force of Yogamāyā.
(Srimad Bhagavatam----10:3:51-----purport).

After Vasudeva bound himself with iron shackles as before, all the doors of the prison house closed by the influence of Yogamāyā, who then began crying as a newborn child, This crying awakened the doorkeepers, who immediately informed Kaṁsa that a child had been born to Devakī. Upon hearing this news, Kaṁsa appeared with great force in the maternity room, and in spite of Devakī's pleas that the child be saved, the demon forcibly snatched the child from Devakī's hands and dashed the child against a rock. Unfortunately for Kaṁsa, however, the newborn child slipped away from his hands, rose above his head and appeared as the eight-armed form of Durgā. Durgā then told Kaṁsa, "The enemy you contemplate has taken birth somewhere else. Therefore your plan to persecute all the children will prove futile."
(Srimad Bhagavatam----10:4----summary).

The activities of Yogamāyā are distinctly visible in this chapter, in which Devakī and Vasudeva excuse Kaṁsa for his many devious, atrocious activities and Kaṁsa becomes repentant and falls at their feet. Before the awakening of the watchmen and the others in the prison house, many other things happened. Kṛṣṇa was born and transferred to the home of Yaśodā in Gokula, the strong doors opened and again closed, and Vasudeva resumed his former condition of being shackled. The watchmen, however, could not understand all this. They awakened only when they heard the crying of the newborn child, Yogamāyā.
(Srimad Bhagavatam----10:4:1-----purport).

Śrīla Viśvanātha Cakravartī Ṭhākura has remarked that the watchmen were just like dogs. At night the dogs in the street act like watchmen. If one dog barks, many other dogs immediately follow it by barking. Although the street dogs are not appointed by anyone to act as watchmen, they think they are responsible for protecting the neighborhood, and as soon as someone unknown enters it, they all begin to bark. Both Yogamāyā and Mahāmāyā act in all material activities (prakṛteḥ kriyamāṇāni guṇaiḥ karmāṇi sarvaśaḥ (B.G.3:27), but although the energy of the Supreme Personality of Godhead acts under the Supreme Lord's direction (mayādhyakṣeṇa prakṛtiḥ sūyate sa-carācaram (B.G.9:10), doglike watchmen such as politicians and diplomats think that they are protecting their neighborhoods from the dangers of the outside world. These are the actions of māyā. But one who surrenders to Kṛṣṇa is relieved of the protection afforded by the dogs and doglike guardians of this material world.
(Srimad Bhagavatam----10:4:1-----purport).

Kaṁsa tried to dash the child downward against a piece of stone, but since she was Yogamāyā, the younger sister of Lord Viṣṇu, she slipped upward and assumed the form of the goddess Durgā. The word anujā, meaning "the younger sister," is significant. When Viṣṇu, or Kṛṣṇa, took birth from Devakī, He must have simultaneously taken birth from Yaśodā also. Otherwise how could Yogamāyā have been anujā, the Lord's younger sister?
(Srimad Bhagavatam----10:4:9-----purport).

In the material world, the living entity must accept different types of bodies. Bhrāmayan sarva-bhūtāni yantrārūḍhāni māyayā (B.G.18:61). According to the living entity's desire, Yogamāyā, or Māyā, the goddess Durgā, gives him a particular type of body, which is mentioned as yantra, a machine. But the living entities who are promoted to the spiritual world do not return to the prison house of a material body (tyaktvā dehaṁ punar janma naiti mām eti so'rjuna (B.G.4:9).
(Srimad Bhagavatam----10:4:13-----purport).