A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms against himself. He makes his failure certain by himself being the first person to be convinced of it.
Hesitation is often like procrastination. One may have vague doubts and feel a need to mull things over; meanwhile, other issues intrude on thought, and no decision is taken. Ask people why they procrastinate, and you probably won't get a crisp answer.
If a man fights his way through his doubts to the conviction that Jesus Christ is Lord, he has attained to a certainty that the man who unthinkingly accepts things can never reach.
Some of our important choices have a time line. If we delay a decision, the opportunity is gone forever. Sometimes our doubts keep us from making a choice that involves change. Thus an opportunity may be missed.
It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt.