The truth is rarely pure and never simple.

Management is an art that requires continuous learning and practice.

The mathematician's patterns, like the painter's or the poet's, must be beautiful; the ideas, like the colors or the words, must fit together in a harmonious way.

I’m not here to be perfect, I’m here to be real.

War is an ugly thing， but not the ugliest of things: the decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth a war， is much worse.

The chief beauty about time is that you cannot waste it in advance. The next year, the next day, the next hour are lying ready for you, as perfect, as unspoiled, as if you had never wasted or misapplied a single moment in all your life. You can turn over a new leaf every hour if you choose.