Srimad Bhagvata Mahapurana: Book 11: Chapter 15: Verses 12-23
(Similarly) concentrating his mind on Meas ensouling the atoms of the (four) elements (other than ether), a Yogi attains (extreme) lightness (of body), viz., the capacity to become as subtle as the subtlest division of time. (Likewise) focussing his entire mind on Me as ensouling the (cosmic) Ego, born of Sattvaguna, the Yogi who has given his mind to Me attains the (Siddhi of) Praprti in the shape of control over the senses of all. He who concentrates his mind on Me as ensouling the (Sutra, the active aspect of) Mahat-tattva attains (the Siddhi known as) Prakamya (easy access to all sorts of enjoyments of one's seeking), the highest Siddl"i possessed by Me as presiding over the Sutra, which is born of the Unmanifest He who focusses his mind on (Me as) the all-pervading Witness, the Ruler of Maya (consisting of the three Gunas), attains(the Siddhi known as) isitva, viz., control over all bodies and conscious selves. The Yogi who concentrates his mind on Me as Lord Narayana, spoken of as the fourth or transcendent principle* (existing beyond the three states of 1. Virat or the Cosmic Person, presiding over the physical plane, 2. Hiranyagarbha, presiding over the astral plane, and 3. the Causal Principle, presiding over the causal plane) and called by the name of Bhagavan (embodying in Himself the six divine properties of universal dominion, righteousness, glory, prosperity, wisdom and dispassion each in its entirety) acquires My virtues and attains (the Siddhi or) Vasita (non-attachment to all material objects). Focussing his pure mind (cleansed through Pranayama etc.), on Me as the transcendent Brahma, one attains supreme bliss (which is only another name for the Siddhi called Kamavasayita), in which all desire ceases (for good). Concentrating his mind on Me as Lord Aniruddha (the Lord of Swetadwipa), who is (absolutely) pure (untainted by the three Gunas) and the embodiment of ( or Propeller of) virtue, man attains (absolute) purity (in the form of no longer being subject to the three Gunas or modes of Prakrti) and is rid of the six waves or changes (viz., hunger and thirst, old age and death, grief and infatuation). Mentally perceiving the (unexpressed) sound in Me as conceived in the form of the cosmic breath, taintless and all pervading like the sky, the said Jiva is able to hear (from a distance) the (diverse) sounds of living beings manifested therein. Uniting the eye with the sun and the sun too with the eye, and contemplating on Me in the aforesaid (mutual) union (of the two), man is gifted with a penetrating vision and is (consequently) able to perceive the (whole) universe. By virtue of the concentration (of mind) practised after uniting with Me the mind and thereafter the body (too) alongwith the breath (accompanying the body), (one attains the Siddhi called Manojava, as a result of which) the body surely finds itself wherever the mind goes. The Yogi gets converted into the very form, sought for by his mind, that he would assume making the mind his material (for that form), the force of concentration of the mind on Me (whose potency is inconceivable and who appear in numerous forms) being the ground of all Siddhis. Seeking to enter another (soulless) body, the Yogi who has controlled his breath as well as his indriyas and mind should conceive himself as present in that body. (Asa result of such contemplation) his vital air (the chief constituent of his astral body, which makes for his Jivahood) leaves his (own) body and becoming one with the cosmic air, enters (alongwith it) the other (through its nostrils) as a black bee passes from one flower to another.