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human life is to develop unalloyed love for Krṣṇa, the Supreme Personality of Godhead.
Lord Caitanya's teachings are identical to those given by Lord Kapila, the original propounder of  sāṅkhya-yoga , the  sāṅkhya  system of philosophy. This authorized system of  yoga  recommends meditation on the transcendental form of the Lord. There is no question of meditating on something void or impersonal. One can meditate on the transcendental form of Lord Viṣṇu even without practicing involved sitting postures. Such meditation is called perfect  samādhi . This perfect  samādhi  is verified at the end of the Sixth Chapter of  Bhagavad-gītā  where Lord Krṣṇa says: "And of all  yogīs , he who always abides in Me with great faith, worshiping Me in transcendental loving service, is most intimately united with Me in  yoga  and is the highest of all." (Bg. 6.47)
Lord Caitanya instructed the mass of people in the  sāṅkhya  philosophy of  acintya-bhedābheda-tattva , which maintains that the Supreme Lord is simultaneously one with and different from His creation. Lord Caitanya taught this philosophy through the chanting of the holy name of the Lord. He taught that the holy name of the Lord is the sound incarnation of the Lord and that since the Lord is the absolute whole, there is no difference between His holy name and His transcendental form. Thus by chanting the holy name of the Lord one can directly associate with the Supreme Lord by sound vibration. As one practices this sound vibration, he passes through three stages of development: the offensive stage, the clearing stage and the transcendental stage. In the offensive stage one may desire all kinds of material happiness, but in the second stage one becomes clear of all material contamination. When one is situated on the transcendental stage, he attains the most coveted position—the stage of loving God. Lord Caitanya taught that this is the highest stage of perfection for human beings.
Yoga  practice is essentially meant for controlling the senses. The central controlling factor of all the senses is the mind; therefore one first has to practice controlling the mind by engaging it in Krṣṇa consciousness. The gross activities of the mind are expressed through the external senses either for the acquiring of knowledge or the functioning of the senses in accordance to the will. The subtle activities of the mind are thinking, feeling and willing. In accordance to one's consciousness, the individual is either polluted or clear. If one's mind is fixed on Krṣṇa (His name, quality, form, pastimes, entourage and paraphernalia), all one's activities—both subtle and gross—become favorable. The  Bhagavad-gītā 's process of purifying consciousness is the process of fixing one's mind on Krṣṇa by talking of His transcendental activities, cleansing His temple, going to His temple, seeing the beautiful transcendental form of the Lord nicely decorated, hearing His transcendental glories, tasting food offered to Him, associating with His devotees, smelling the flowers and  tulasī  leaves offered Him, engaging in activities for the Lord's interest, etc. No one can bring the activities of the mind and senses to a stop, but one can purify these activities through a change in consciousness. This change is indicated in  Bhagavad-gītā  when Krṣṇa tells Arjuna of the knowledge of  yoga  whereby one can work without fruitive results. "O son of Pṛthā, when you act by such intelligence, you