To hear about Kṛṣṇa from Vedic literatures, or to hear from Him directly through the Bhagavad-gītā, is itself righteous activity. And for one who hears about Kṛṣṇa, Lord Kṛṣṇa, who is dwelling in everyone's heart, acts as a best-wishing friend and purifies the devotee who constantly engages in hearing of Him. In this way, a devotee naturally develops his dormant transcendental knowledge. As he hears more about Kṛṣṇa from the Bhāgavatam and from the devotees, he becomes fixed in the devotional service of the Lord. By development of devotional service one becomes freed from the modes of passion and ignorance, and thus material lusts and avarice are diminished. When these impurities are wiped away, the candidate remains steady in his position of pure goodness, becomes enlivened by devotional service and understands the science of God perfectly. Thus bhakti-yoga severs the hard knot of material affection and enables one to come at once to the stage of asaṁśayaṁ-samagram, understanding of the Supreme Absolute Truth Personality of Godhead." (SB 1.2.17-21) Therefore only by hearing from Kṛṣṇa or from His devotee in Kṛṣṇa consciousness can one understand the science of Kṛṣṇa.
(Bhagavad-Gita----7:1----purport).

A person in full Kṛṣṇa consciousness acts by the dictation of Kṛṣṇa. In the beginning of Kṛṣṇa consciousness, dictation is received through the transparent medium of the spiritual master. When one is sufficiently trained and acts in submissive faith and love for Kṛṣṇa under the direction of the bona fide spiritual master, the dovetailing process becomes more firm and accurate. This stage of devotional service by the devotee in Kṛṣṇa consciousness is the most perfect stage of the yoga system. At this stage, Kṛṣṇa, or the Supersoul, dictates from within, while from without the devotee is helped by the spiritual master, who is the bona fide representative of Kṛṣṇa. From within He helps the devotee as caitya, for He is seated within the heart of everyone. Understanding that God is seated within everyone's heart is not, however, sufficient. One has to be acquainted with God from both within and without, and one must take dictation from within and without to act in Kṛṣṇa consciousness. This is the highest perfectional stage of the human form of life and the topmost perfection of all yoga.
(Srimad Bhagavatam----3:15:45----purport).

During the daytime in autumn, the sun is very scorching, but at night, due to the clear moonshine, people get relief from the day’s fatigue. Similarly, a person who takes shelter of Mukunda, or Kṛṣṇa, can be saved from the fatigue of misidentifying the body with the self. Mukunda, or Kṛṣṇa, is also the source of solace for the damsels of Vṛndāvana. The damsels of Vrajabhūmi are always suffering because of separation from Kṛṣṇa, but when they meet Him during the moonlit autumn night, their fatigue of separation is relieved. When the sky is clear of all clouds, the stars at night shine very beautifully; similarly, when a person is actually situated in Kṛṣṇa consciousness, he is cleared of all dirty things, and he becomes as beautiful as the stars in the autumn sky. Although the Vedas contain instructions for pursuing knowledge (jñāna), for practicing mystic yoga and for engaging in karmic activities in the form of sacrifices, the ultimate purpose of the Vedas is stated in the Bhagavad-gītā: one has to accept Kṛṣṇa consciousness after thoroughly studying the Vedas. Therefore the clean heart of a devotee in Kṛṣṇa consciousness can be compared to the clean sky of the autumn season. During autumn, the moon looks very bright along with the stars in the clear sky. Lord Kṛṣṇa Himself appeared in the sky of the Yadu dynasty, and He was exactly like the moon surrounded by the stars, or the members of the Yadu dynasty. When there are ample blooming flowers in the gardens in the forest, the fresh, aromatic breeze gives a great relief to the person who has suffered during the summer and rainy seasons. Unfortunately, such breezes could not give any relief to the gopīs because of their hearts’ dedication to Kṛṣṇa. People in general might have taken pleasure in that nice autumn breeze, but the gopīs, not being embraced by Kṛṣṇa, were not very much satisfied.
(Krsna Book).

Those who are situated on the platform of śānta-rasa get their impetus for advancement in devotional service by smelling the tulasī offered at the lotus feet of the Lord, by hearing the sound of His conchshell, by seeing a sanctified place in some mountain or hill, by observing a forest like the ones in Vṛndāvana, by going to a place of pilgrimage, by visiting the course of the Ganges River, by being victorious over the dictations of bodily demands (i.e., eating, sleeping, mating and defending), by understanding the devastation of eternal time and by constantly associating with devotees engaged in Kṛṣṇa consciousness. All these different items are favorable in elevating saintly persons situated in śānta-rasa to the advanced stage of devotional service.
(Nectar of Devotion).

The Kṛṣṇa consciousness movement is meant for devas, or devotees. Demons cannot take part in Kṛṣṇa conscious activities, nor can devotees in Kṛṣṇa consciousness take part in demoniac activities or work like cats and dogs simply for sense gratification. Such activity does not appeal to those in Kṛṣṇa consciousness. Devotees accept only the bare necessities of life to keep themselves fit to act in Kṛṣṇa consciousness. The balance of their energy is used for developing Kṛṣṇa consciousness, through which one can be transferred to the abode of Kṛṣṇa by always thinking of Him, even at the point of death.
(Sri Caitanya Caritamrta----1:3:91----purport).

The saṅkīrtana movement can be spread by a person who is especially favored by Lord Kṛṣṇa (kṛṣṇa-śakti vinā nahe tāra pravartana). Without first obtaining the mercy of the Lord, one cannot spread the holy name of the Lord. One who can spread the Lord’s name is called labdha-caitanya in the words of Bhaktisiddhānta Sarasvatī. The labdha-caitanya is one who has actually awakened his original consciousness, Kṛṣṇa consciousness. The influence of the pure devotees in Kṛṣṇa consciousness is such that it can awaken others to become immediately Kṛṣṇa conscious and engage themselves in the transcendental loving service of Kṛṣṇa. In this way the descendants of pure devotees increase, and Lord Caitanya Mahāprabhu takes much pleasure in seeing the increase of His devotees. The word su-medhasaḥ means “sharply intelligent.” When one’s intelligence is sharp, he can increase the interests of common men in loving Caitanya Mahāprabhu and through Him in loving Rādhā-Kṛṣṇa. Those not interested in understanding Śrī Caitanya Mahāprabhu are simply material in their attempts at professional chanting and dancing for money, despite their supposed artistry. If one does not have full faith in Śrī Caitanya Mahāprabhu, he cannot properly chant and dance in the saṅkīrtana movement. Artificial chanting and dancing may be due to sentiments or sentimental agitation, but this cannot help one advance in Kṛṣṇa consciousness.
(Sri Caitanya Caritamrta----2:11:102----purport).

In the material concept of life, when one works for sense gratification, there is misery, but in the absolute world, when one is engaged in pure devotional service, there is no misery. The devotee in Kṛṣṇa consciousness has nothing for which to lament or desire. Since God is full, a living entity who is engaged in God's service, in Kṛṣṇa consciousness, becomes also full in himself. He is just like a river cleansed of all dirty water. Because a pure devotee has no thought other than Kṛṣṇa, he is naturally always joyful. He does not lament for any material loss or aspire for gain, because he is full in the service of the Lord. He has no desire for material enjoyment, because he knows that every living entity is a fragmental part and parcel of the Supreme Lord and therefore eternally a servant. He does not see, in the material world, someone as higher and someone as lower; higher and lower positions are ephemeral, and a devotee has nothing to do with ephemeral appearances or disappearances. For him stone and gold are of equal value.
(Bhagavad-Gita----18:54----purport).

When fire, light, day and the fortnight of the moon are mentioned, it is to be understood that over all of them there are various presiding deities who make arrangements for the passage of the soul. At the time of death, the mind carries one on the path to a new life. If one leaves the body at the time designated above, either accidentally or by arrangement, it is possible for him to attain the impersonal brahmajyoti. Mystics who are advanced in yoga practice can arrange the time and place to leave the body. Others have no control—if by accident they leave at an auspicious moment, then they will not return to the cycle of birth and death, but otherwise there is every possibility that they will have to return. However, for the pure devotee in Kṛṣṇa consciousness, there is no fear of returning, whether he leaves the body at an auspicious or inauspicious moment, by accident or arrangement.
(Bhagavad-Gita----8:24----purport).

Because a devotee is freed from all contaminated material association, he is not affected by the miseries of material existence. Even though he appears to be in the material world, he is not affected by the miseries of the material world. How is it possible? There is a very good example in the activities of the cat. The cat carries her kittens in her mouth, and when she kills a rat she also carries the booty in her mouth. Thus both are carried in the mouth of the cat, but they are in different conditions. The kitten feels comfort in the mouth of the mother, whereas when the rat is carried in the mouth of the cat, the rat feels the blows of death. Similarly, those who are sādhavaḥ, or devotees engaged in Kṛṣṇa consciousness in the transcendental service of the Lord, do not feel the contamination of material miseries, whereas those who are not devotees in Kṛṣṇa consciousness actually feel the miseries of material existence. One should therefore give up the association of materialistic persons and seek the association of persons engaged in Kṛṣṇa consciousness, and by such association he will benefit in spiritual advancement. By their words and instructions, he will be able to cut off his attachment to material existence.
(Srimad Bhagavatam----3:25:24----purport).

As usual, a devotee in an adverse condition of life accepts such a condition to be the mercy of the Lord. Factually, the insulting words used by Dakṣa against Lord Śiva were enough to have him thrown perpetually into a hellish life. But Lord Śiva, being kind toward him, awarded him punishment to neutralize the offense. King Dakṣa realized this and, feeling obliged for Lord Śiva's magnanimous behavior, wanted to show his gratitude. Sometimes a father punishes his child, and when the child is grown up and comes to his senses, he understands that the father's punishment was not actually punishment but mercy. Similarly, Dakṣa appreciated that the punishment offered to him by Lord Śiva was a manifestation of Lord Śiva's mercy. That is the symptom of a person making progress on the path of Kṛṣṇa consciousness. It is said that a devotee in Kṛṣṇa consciousness never takes any miserable condition of life to be condemnation by the Supreme Personality of Godhead. He accepts the miserable condition to be the grace of the Lord. He thinks, "I would have been punished or put into a more dangerous condition of life due to my past misdeeds, but the Lord has protected me. Thus I have received only a little punishment as token execution of the law of karma." Thinking of His grace in that way, a devotee always surrenders to the Supreme Personality of Godhead more and more seriously and is not disturbed by such so-called punishment.
(Srimad Bhagavatam----4:7:15----purport).

The fish brings up its offspring simply by looking at them. The tortoise brings up its offspring simply by meditation. The eggs of the tortoise are laid on land, and the tortoise meditates on the eggs while in the water. Similarly, the devotee in Kṛṣṇa consciousness, although far away from the Lord's abode, can elevate himself to that abode simply by thinking of Him constantly—by engagement in Kṛṣṇa consciousness. He does not feel the pangs of material miseries; this state of life is called brahma-nirvāṇa, or the absence of material miseries due to being constantly immersed in the Supreme.
(Bhagavad-Gita----5:26----purport).

A very advanced devotee in Kṛṣṇa consciousness does not want riches, followers or possessions. Rāyaḥ kalatraṁ paśavaḥ sutādayo gṛhā mahī kuñjara-kośa-bhūtayaḥ. The satisfaction of possessing material opulences, although perhaps of a different standard, is available even in the lives of dogs and hogs, who cannot revive their eternal relationship with Kṛṣṇa. In human life, however, our eternal, dormant relationship with Kṛṣṇa is possible to revive. Therefore Prahlāda Mahārāja has described this life as arthadam. Consequently, instead of wasting our time for economic development, which cannot give us any happiness, if we simply try to revive our eternal relationship with Kṛṣṇa, we will properly utilize our lives.
(Srimad Bhagavatam----7:7:39----purport).

Once one is fixed in the devotional service of the Lord, his position of transcendental service cannot be destroyed, and the pleasure and service simply increase unlimitedly. For the devotees engaged in Kṛṣṇa consciousness, in the Vaikuṇṭha atmosphere, there is no influence of time. In the material world the influence of time destroys everything, but in the Vaikuṇṭha atmosphere there is no influence of time or of the demigods because there are no demigods in the Vaikuṇṭha planets. Here our activities are controlled by different demigods; even if we move our hand and leg, the action is controlled by the demigods. But in the Vaikuṇṭha atmosphere there is no influence of the demigods or of time; therefore there is no question of destruction. When the time element is present, there is the certainty of destruction, but when there is no time element—past, present or future—then everything is eternal. Therefore this verse uses the words na naṅkṣyanti, indicating that the transcendental opulences will never be destroyed.
(Srimad Bhagavatam----3:25:38----purport).

Śrī Yāmunācārya, a great devotee in Kṛṣṇa consciousness, said:
yad-avadhi mama cetaḥ kṛṣṇa-pādāravinde
nava-nava-rasa-dhāmany udyataṁ rantum āsīt
tad-avadhi bata nārī-saṅgame smaryamāne
bhavati mukha-vikāraḥ suṣṭhu niṣṭhīvanaṁ ca
"Since I have been engaged in the transcendental loving service of Kṛṣṇa, realizing ever-new pleasure in Him, whenever I think of sex pleasure I spit at the thought, and my lips curl with distaste."
(Bhagavad-Gita----5:21----purport).

To enable one to achieve perfection, Kṛṣṇa gives one the chance to remember Him again. This is proved here, for although the King of the elephants, Gajendra, was put in danger, this was a chance for him to remember his previous devotional activities so that he could immediately be rescued by the Supreme Personality of Godhead. It is imperative, therefore, that all devotees in Kṛṣṇa consciousness practice chanting some mantra. Certainly one should chant the Hare Kṛṣṇa mantra, which is the mahā-mantra, or great mantra, and also one should practice chanting cintāmaṇi-prakara-sadmasu or the Nṛsiṁha strotra (ito nṛsiṁhaḥ parato nṛsiṁho yato yato yāmi tato nṛsiṁhaḥ). Every devotee should practice in order to chant some mantra perfectly so that even though he may be imperfect in spiritual consciousness in this life, in his next life he will not forget Kṛṣṇa consciousness, even if he becomes an animal. Of course, a devotee should try to perfect his Kṛṣṇa consciousness in this life, for simply by understanding Kṛṣṇa and His instructions, after giving up this body one can return home, back to Godhead. Even if there is some falldown, practice of Kṛṣṇa consciousness never goes in vain.
(Srimad Bhagavatam----8:3:1----purport).

Since this temporary material world is full of the miseries of birth, old age, disease and death, naturally he who achieves the highest perfection and attains the supreme planet, Kṛṣṇaloka, Goloka Vṛndāvana, does not wish to return. The supreme planet is described in Vedic literature as avyakta and akṣara and paramā gati; in other words, that planet is beyond our material vision, and it is inexplicable, but it is the highest goal, the destination for the mahātmās (great souls). The mahātmās receive transcendental messages from the realized devotees and thus gradually develop devotional service in Kṛṣṇa consciousness and become so absorbed in transcendental service that they no longer desire elevation to any of the material planets, nor do they even want to be transferred to any spiritual planet. They only want Kṛṣṇa and Kṛṣṇa's association, and nothing else. That is the highest perfection of life. This verse specifically mentions the personalist devotees of the Supreme Lord, Kṛṣṇa. These devotees in Kṛṣṇa consciousness achieve the highest perfection of life. In other words, they are the supreme souls.
(Bhagavad-Gita----8:15----purport).