When a truth is learned, it must be practiced. Indeed, knowledge that is not put into practice is not truly learned; it soon fades away like a mirage. The person who claims to be wise and devout, but who never acts on his wisdom, is engaging in Hypocrisy. Conversely, action without learning is also foolish. In the East, people are taught the virtue of being reserved and taciturn in order that they might not display knowledge that they not yet mastered in practice. It is far better first to act on an idea in private and see to its result than to announce it to others while it is yet untested and unmastered. This reserve is especially apt in the case of religious and moral teaching, whose practice is not easy. Only a teacher who has first mastered and embodied his teaching is worthy of respect.
(from the book: World’s Scriptures II)