If a man speaks or acts with pure thought, happiness follows him like a shadow that never leaves him

People whoare too concerned with how well they are doing will be less successful andfeel less competent than those who focus on the task itself... Somepsychologists call it a conflict between egoorientation, or between extrinsicand intrinsic motivation...

You can be erudite with knowledge of others; you can be wise only with your wisdom.

Deep-seatedpreferences cannot be argued about.

Neverdoubt that a small group of thoughtful, committed people can change theworld. Indeed, it's the only thing that ever has.

Makesure you never, never argue at night. You just lose a good night's sleep, andyou can't settle anything until morning anyway.

Thewise man, even when he holds his tongue, says more than the fool when hespeaks.

Wordsare, of course, the most powerful drug used by mankind.

Trust exists; only lies are invented.

We do not err because the truth is difficult to see. We err because this is more comfortable

The power to do good is also the power to do harm.

Can we do good to the world? In an absolute sense, no; in a relative sense, yes.