If the only way is up because there 's no way down ; if you have to go on because you're out of food ; if you don ' t think you can mak e it (but you 're afraid to say so) but you do it anyway- th en you learn confidence in yourself. in yourself. If the rock doesn't hold and neither does the first piton but your belayer does; if the kayak flips and your boat partner hauls you out; if you realize that everyone has to pull together or you'll all be shafted- then you learn to trust people.