The living entity, by accepting his material existence, has become situated differently than in his spiritual existence. But if one understands that the Supreme is situated in His Paramātmā manifestation everywhere, that is, if one can see the presence of the Supreme Personality of Godhead in every living thing, he does not degrade himself by a destructive mentality, and he therefore gradually advances to the spiritual world. The mind is generally addicted to sense gratifying processes; but when the mind turns to the Supersoul, one becomes advanced in spiritual understanding.
(Bhagavad-Gita-----13:29-----purport).

This attainment of the Brahman conception of life is the first stage in self-realization. At this stage the Brahman-realized person is transcendental to the material position, but he is not actually perfect in Brahman realization. If he wants, he can continue to stay in the Brahman position and then gradually rise up to Paramātmā realization and then to the realization of the Supreme Personality of Godhead. There are many examples of this in Vedic literature. The four Kumāras were situated first in the impersonal Brahman conception of truth, but then they gradually rose to the platform of devotional service. One who cannot elevate himself beyond the impersonal conception of Brahman runs the risk of falling down.
(Bhagavad-Gita-----14:27-----purport).

It is understood that all the planets are floating in the air only by the energy of the Lord. The Lord enters into every atom, every planet, and every living being. That is discussed in the Brahma-saṁhitā. It is said there that one plenary portion of the Supreme Personality of Godhead, Paramātmā, enters into the planets, the universe, the living entity, and even into the atom. So due to His entrance, everything is appropriately manifested. When the spirit soul is there, a living man can float on the water, but when the living spark is out of the body and the body is dead, the body sinks. Of course when it is decomposed it floats just like straw and other things, but as soon as the man is dead, he at once sinks in the water.
(Bhagavad-Gita-----15:13-----purport).

The Supreme Lord is situated as Paramātmā in everyone's heart, and it is from Him that all activities are initiated. The living entity forgets everything of his past life, but he has to act according to the direction of the Supreme Lord, who is witness to all his work. Therefore he begins his work according to his past deeds. Required knowledge is supplied to him, and remembrance is given to him, and he forgets, also, about his past life. Thus, the Lord is not only all-pervading; He is also localized in every individual heart. He awards the different fruitive results. He is worshipable not only as the impersonal Brahman, the Supreme Personality of Godhead, and the localized Paramātmā, but as the form of the incarnation of the Vedas as well.
(Bhagavad-Gita-----15:15-----purport).

"After I leave my connections, who will protect me?" he should not accept the renounced order of life. One must be fully convinced that Kṛṣṇa or the Supreme Personality of Godhead in His localized aspect as Paramātmā is always within, that He is seeing everything and He always knows what one intends to do. One must thus have firm conviction that Kṛṣṇa as Paramātmā will take care of a soul surrendered to Him. "I shall never be alone," one should think. "Even if I live in the darkest regions of a forest I shall be accompanied by Kṛṣṇa, and He will give me all protection." That conviction is called abhayam, fearlessness. This state of mind is necessary for a person in the renounced order of life.
(Bhagavad-Gita-----16:1-3-----purport).

Therefore one should worship the Supreme Lord with His energies. Generally the Vaiṣṇava devotees worship the Supreme Lord with His internal energy. His external energy is a perverted reflection of the internal energy. The external energy is a background, but the Supreme Lord by the expansion of His plenary portion as Paramātmā is situated everywhere. He is the Supersoul of all demigods, all human beings, all animals, everywhere. One should therefore know that as part and parcel of the Supreme Lord one has his duty to render service unto the Supreme. Everyone should be engaged in devotional service to the Lord in full Kṛṣṇa consciousness.
(Bhagavad-Gita-----18:46-----purport).

The Paramātmā, or Supersoul, who is present within the heart of every living entity and within every atom of the universe, is but the partial representation of Lord Caitanya. Therefore Śrī Kṛṣṇa Caitanya, being the basis of both Brahman and the all-pervading Paramātmā as well, is the Supreme Personality of Godhead. As such, He is full in six opulences: wealth, fame, strength, beauty, knowledge and renunciation. In short, we should know that He is Kṛṣṇa, God, and that nothing is equal to or greater than Him. There is nothing superior to be conceived. He is the Supreme Person.
(Teachings of Lord Caitanya).

"Kṛṣṇa should be known as the soul of all souls, for He is the soul of all individual souls and the soul of the localized Paramātmā as well. At Vṛndāvana He acted just like a human being to attract people to Him and show that He is not formless." (Śrīmad-Bhāgavatam 10.14.55)The Supreme Lord is as much an individual as other living beings, but He is different in that He is the Supreme and all other living beings are subordinate to Him. All other living beings can enjoy spiritual bliss, eternal life and full knowledge in His association.

(Teachings of Lord Caitanya).

Because the Lord is on the absolute platform, there is no difference between the holy name of the Lord and the Supreme Lord Himself. There are many different names for the Supreme Lord, such as Paramātmā(the Supersoul), Brahman (the Supreme Absolute), Sṛṣṭikartā(the creator), Nārāyaṇa (the transcendental Lord), Rukmiṇī-ramaṇa (the husband of Rukmiṇī), Gopīnātha (the enjoyer of the gopīs) and Kṛṣṇa. In this way the Lord has different names, and these names indicate different functions. The aspect of the Supreme Lord as the creator is different from His aspect as Nārāyaṇa. Some of the names of the Lord as the creator are conceived by materialistic men. One cannot fully realize the essence of the Supreme Personality of Godhead by understanding His name as the creator because this material creation is a function of the external energy of the Supreme Lord. Thus the conception of God as the creator includes only the external feature. Similarly, when we call the Supreme Lord Brahman, we cannot have any understanding of His six opulences. In Brahman realization, the six opulences are not realized in full, nor is there recognition of eternity, bliss and knowledge. Therefore Brahman realization is also not a complete understanding of the Supreme Lord. Nor is Paramātmā realization, realization of the Supersoul, full realization of the Supreme Personality of Godhead, for the all-pervading nature of the Supreme Lord is but a partial representation of His opulence.
(Teachings of Lord Caitanya).

According to the Bhāgavata Purāṇa, the Supreme Truth is realized in three stages. First there is impersonal Brahman, or the impersonal Absolute; then the Paramātmā, or localized aspect of Brahman. The neutron of the atom may be taken as the representation of Paramātmā, who also enters into the atom. This is described in the Brahma-saṁhitā. But ultimately the Supreme Divine Being is realized as the supreme all-attractive person (Kṛṣṇa) with full and inconceivable potencies of opulence, strength, fame, beauty, knowledge and renunciation. These six potencies are fully exhibited by Śrī Rāma and Śrī Kṛṣṇa when They descend before human beings. Only a section of human beings—the unalloyed devotees—can recognize Kṛṣṇa on the authority of revealed scriptures, but others are bewildered by the influence of material energy.
(Easy journey to other Planets).