Success breeds softness. It also breeds fear: We become addicted to our creature comforts. And then we become afraid of losing them. - Ryan Holiday

Too much study and not enough doing creates a paucity of knowledge, a shelter of naïveté, no matter how smart you are.

"If an emotion can't change the condition or the situation you're dealing with, it is likely an unhelpful emotion. Or, quite possibly, a destructive one. But it's what I feel. Right, no one said anything about not feeling it. No one said you can't ever cry. Forget "manliness." If you need to take a moment, by all means, go ahead. Real strength lies in the control or, as Nassim Taleb put it, the domestication of one's emotions, not in pretending they don't exist."

Uncertainty and fear are relieved by authority. Training is authority.