Great things alone can make a great mind, and petty things will make a petty mind unless a man rejects them as completely alien.

The more physical the activity, the less the difficulties will be. The more the activity becomes intellectual and turns into motives which exercise a determini…

Knowledge in war is very simple, being concerned with so few subjects, and only with their final results at that. But this does not make its application easy.

...talent and genius operate outside the rules, and theory conflicts with practice.

I don't dwell in the past; I don't wallow in old events and emotions. I don't waste time on regret. No use going over and over the details of what already happ…

Ambition is the death of thought. (p. 77e)

A definite purpose, like blinders on a horse, inevitably narrows its possessor's point of view.