One must rely on the Divine and yet do some enabling sadhana—the Divine gives the fruits, not by the measure of the sadhana but by the measure of the soul and its aspiration. Also worrying does no good—“I shall be this, I shall be that, what shall I be?” Say “I am ready to be not what I want, but what the Divine wants me to be”—all the rest should go on that base.
Ref: Letters on Yoga – II