"Kṛṣṇa is explaining Himself in the Bhagavad-gītā, Kṛṣṇa is sending His representative ācārya to teach you, and Kṛṣṇa is within yourself trying to teach you if you are actually serious. Then where is the difficulty? Inside, outside, always, books, knowledge—He is prepared. So where is the difficulty to make yourself perfect in Kṛṣṇa consciousness? There is no difficulty at all. Provided you are serious, you can become fully Kṛṣṇa conscious in this very life. You are all young men. You are not old man like me. I have no opportunity."
(Srila Prabhupada Lecture, Mayapur, April 6, 1975)