Do you think you can teach even a child?

You cannot. The child teaches himself. Your duty is to afford opportunities and to remove obstacles. A plant grows. Do you make the plant grow? Your duty is to put a hedge round it and see that no animal eats up the plant, and there your duty ends. The plant grows of itself. So it is in regard to the spiritual growth of every man. None can teach you; none can make a spiritual man of you. You have to teach yourself; your growth must come from inside.

Swami Vivekananda

(CW/V2/Practical Vedanta and other lectures/The Ideal of a Universal Religion)