It is not that you have to become completely perfect by following certain process. If you simply perfectly follow the instruction of Kṛṣṇa, then you become perfect. That is required. Don't adulterate. Then you'll never become perfect. Other processes—yoga, dhyāna, karma, jñāna . . . there are many processes to make oneself perfect, but even becoming perfect, you cannot understand Kṛṣṇa. Yoginām . . . manuṣyāṇāṁ sahasreṣu kaścid yatati siddhaye (BG 7.3). Siddhaye means perfection. Yatatām api siddhānāṁ kaścid vetti māṁ tattvataḥ. Even you become perfect, still, it is doubtful whether you have understood Kṛṣṇa. This is the position.
Therefore the conclusion is that if you simply follow the perfect instruction of Kṛṣṇa, then automatically you become perfect, however imperfect you may be. That is our duty. It is not very difficult. Just like a child, a boy, a child, he's asking father, "My dear father, what is this?" An intelligent child questions like that. The father explains, "This is this," and the child accepts. Then his knowledge is perfect. Why the child should endeavor to understand little things as it is? It will take long, long years. And it may not be perfect. But if he accepts the instruction of the father or mother, immediately he becomes perfect.
There are many other examples. Just like a child wants to know who is father. The mother says: "My dear child, this gentleman is your father"—that is perfect knowledge. But if the child wants to research who is his father, it is impossible to find out. Similarly, if we want to know the supreme father, Kṛṣṇa, or God, we have to take instruction from the supreme father, not speculating, just like by speculating we cannot understand our ordinary father without the instruction of mother. If you go on speculating, "He may be my father. He may be my father. He may be father," go on speculating, but you will never understand who is your father. But you accept the authoritative statement of your mother that, "He is your father"—that is perfect knowledge.