Going halfway with half a heart digs the deeper grave. If you enter an action with less than total confidence, you set up obstacles in your own path. When a problem arises you will grow confused, seeing options where there are none and inadvertently creating more problems still. Retreating from the hunter, the timid hare scurries more easily into his snares.
Hesitation creates gaps, boldness obliterates them. When you take time to think, to hem and haw, you create a gap that allows others to think as well. Your timidity infects people with awkward energy, elicits embarrassment. Doubt springs up on all sides.
Boldness destroys such gaps. The swiftness of the move and energy of the action leaves others no space to doubt and worry. Hesitation is fatal - it makes your victim conscious of your intentions.