Restraint means that we want to do something, but we are not sure how it will turn out. In not knowing how it will turn out, we tend to constrict ourselves inside.
Restraint is where we hold ourselves back from living our life fully and where we won't allow ourselves to move forward because the thoughts and beliefs we are holding onto block us from looking and perceiving accurately. When we restrain ourselves, we go out of balance.
Part of this process is thinking that if we make a mistake, it will be a disaster. But the opportunity in making a mistake is, when we know what the mistake is, we can correct it. When we correct it, we're wiser than before we made the mistake. A mistake shows you what we can learn.
Do not be afraid of mistakes. This planet is full of them.
(From: Living the Spiritual Principles of Health and Well-Being by John-Roger, DSS with Paul Kaye)