The coward only threatens when he is safe.

The really unhappy person is the one who leaves undone what they can do, and starts doing what they don't understand; no wonder they come to grief.

The greatest step forward would be to see that everything factual is already theory. The blueness of the sky reveals the basic lawof chromatics. Don't look for anything behind the phenomena, they themselves are the doctrine.

Art is long, life short, judgment difficult, opportunity transient. To act is easy, to think is hard; to act according to our thought is troublesome. Every beginning is cheerful: the threshold is the place of expectation.

The old lose one of the greatest privileges of man, for they are no longer judged by their contemporaries.

Humans fear reason, but they ought to fear stupidity- for reason can be hard, but stupidity can be fatal.

Certain defects are necessary for the existence of individuality.