Action is a great restorer and builder of confidence. Inaction is not only the result, but the cause, of fear. Perhaps the action you take will be successful; perhaps different action or adjustments will have to follow. But any action is better than no action at all.
Norman Vincent Peale (May 31, 1898 December 24, 1993) was a Christian preacher and author (most notably of The Power of Positive Thinking) and a progenitor of the theory of "positive thinking".