If you want a confidence, act as if you already have it. Try the "as if" technique.

Geniuses are commonly believed to excel other men in their power of sustained attention . . . But it is their genius making them attentive, not their attention making geniuses of them.

A little cooling down of animal excitability and instinct, a little loss of animal toughness, a little irritable weakness and descent of the pain-threshold, will bring the worm at the core of all our usual springs of delight into full view, and turn us into melancholy metaphysicians.

The most immutable barrier in nature is between one man's thoughts and another's.

So far war has been the only force that can discipline a whole community, and until an equivalent discipline is organized, I believe that war must have its way.

So to feel brave, act as if we were brave, use all our will to that end...and a courage-fit will very likely replace the fit of fear.

Act the part and you will become the part.