"One who has unflinching devotion for the Supreme Lord and is directed by the spiritual master can see the Supreme Personality of Godhead by revelation. For one who does not take personal training under the guidance of a bona fide spiritual master, it is impossible to even begin to understand Kṛṣṇa. The word tu is specifically used here to indicate that no other process can be used, can be recommended, or can be successful in understanding Kṛṣṇa." (Bg. 11.54.)
What does Srila Prabhupada's personal training mean for us?
The potency of transcendental sound is never minimized because the vibrator is apparently absent. (SB. 2.9.8 Purport)
The service of the spiritual master is essential. If there is no chance to serve the spiritual master directly, a devotee should serve him by remembering his instructions. There is no difference between the spiritual master's instructions and the spiritual master himself. In his absence, therefore, his words of direction should be the pride of the disciple. (CC. Adi 1.35 Purport)
It is better service to Krishna and Spiritual Master in a feeling of separation; sometimes there is risk in the matter of direct service. (Letter to Madhusudana – San Francisco 30 December, 1967)
If it is possible to go to the temple, then take advantage of the temple. A temple is a place where by one is given the opportunity to render direct devotional service to the Supreme Lord Sri Krishna. In conjunction with this you should always read my books daily and all your questions will be answered and you will have a firm basis of Krishna Consciousness. In this way your life will be perfect.
( Letter to:Hugo Salemon 22 November1974 )