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Śrīmad-Bhāgavatam
[Canto 3, Ch. 15]
all other engagements and simply surrender unto Him for perpetual bliss and an eternal life full of knowledge. This is the last instruction of  Bhagavad-gītā , the most authorized and widely read book on all varieties of  yoga . Thus the last word of  Bhagavad-gītā  is the last word in the perfection of  yoga .
It is stated in  Bhagavad-gītā  that a person who is always absorbed in Kṛṣṇa consciousness is the topmost  yogī . What is Kṛṣṇa consciousness? As the individual soul is present by his consciousness throughout his entire body, so the Supersoul or Paramātmā is present throughout the whole creation by superconsciousness. This superconscious energy is imitated by the individual soul, who has limited consciousness. I can understand what is going on within my limited body, but I cannot feel what is going on in another's body. I am present throughout my body by my consciousness, but my consciousness is not present in another's body. The Supersoul or Paramātmā, however, being present everywhere and within everyone, is also conscious of everyone's existence. The theory that the soul and the Supersoul are one is not acceptable because it is not confirmed by authoritative Vedic literature. The individual soul's consciousness cannot act in superconsciousness. This superconsciousness can be achieved, however, by dovetailing individual consciousness with the consciousness of the Supreme. This dovetailing process is called surrender, or Kṛṣṇa consciousness. From the teachings of  Bhagavad-gītā  we learn very clearly that Arjuna, in the beginning, did not want to fight with his brothers and relatives, but after understanding  Bhagavad-gītā  he dovetailed his consciousness with the superconsciousness of Kṛṣṇa. He was then in Kṛṣṇa consciousness.
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 both from 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 .
For a perfect  yogī , there are eight kinds of super-achievements: One can become lighter than air, one can become smaller than the atom, one can