Prabhupāda: So Kṛṣṇa is within you. He knows whether you are cheater and whether you are sincere. So therefore He says: "Those who are sincere and twenty-four hours engaged in My service, I give them intelligence." What kind of intelligence? "To... as he may come back to Me, that kind of intelligence." Because that is our aim, back to home, back to Godhead.
So Kṛṣṇa is prepared to help you, Paramātmā. Sarvas... in another place it is said, sarvasya cāhaṁ hṛdi sanniviṣṭaḥ (BG 15.15). Read Bhagavad-gītā thoroughly, and be sincere and make your life successful. Don't be cheater. Read and follow, and Kṛṣṇa will help you, this life. Don't expect another life to prepare. "It is guaranteed human life?" somebody asking. Even if it guaranteed, why should you take the chance of another life? Finish this business in this life. Take help from Kṛṣṇa, take help from books, take from your spiritual master. Why another life? Another life... suppose you get another human life. Is it guaranteed? You may fall down again. So my Guru Mahārāja used to say that "Finish all business in this life." Na mocayed yaḥ samupeta-mṛtyum (SB 5.5.18). Finish this business of birth, death, old age and disease in this life. You can do that. This is our main business, not to make arrangement for eating, sleeping, mating and defending under different garb, under different pretext. That is not our business.
(Srila Prabhupada Lecture, Honolulu, January 20, 1974)