In the beginning there may be some failures. That is quite natural. Just a child is trying to stand, he may fall down. But that does not mean he should give up the idea. Go on. A time will come come when he will be perfect. So we should not give up this business, to try to serve the Supreme. May be imperfect in the beginning, but stick to it, and a time will come when you'll be perfect, Krsna conscious.

From Srila Prabhupada's lecture on Bhagavad-gita 3.31-43 — Los Angeles, January 1, 1969