First principle: one must need strength, otherwise one will never have it. Twilight of the Idols

To judge the appearances we receive of things, we should need a judicatory instrument; to verify this instrument, we should need a demonstration; to rectify this demonstration, we should need an instrument: so here we are arguing in a circle. Seeing the senses cannot decide our dispute, being themselves full of uncertainty, we must have recourse to Reason; there is no reason but must be built upon another reason, so here we are retreating backwards to all eternity. Essays

Look round at the courses of the stars, as if thou wert going along with them; and constantly consider the changes of the elements into one another; for such thoughts purge away the filth of the terrene life. Book VII

Somewhere in the world there is a defeat for everyone. Some are destroyed by defeat, and some made small and mean by victory. Greatness lives in one who triumphs equally over defeat and victory. The Acts of King Arthur and His Noble Knights