He who never made a mistake, never made a discovery.

Man can learn nothing unless he proceeds from the known to the unknown.

I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach, and not, when I came to die, discover that I had not lived.

I do not know what I may appear to the world; but to myself I seem to have been only like a boy playing on the seashore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.

Leaders must understand that some people will inevitably sell out to the evil side. Don't waste your time wondering why; spend your time discovering who.

When we seek to discover the best in others, we somehow bring out the best in ourselves.

If I have ever made any valuable discoveries, it has been owning more to patient attention, than to any other talent.

The poets and philosophers before me discovered the unconscious; what I discovered was the scientific method by which the unconscious can be studied.

The greatest revolution of our generation is the discovery that human beings, by changing the inner attitudes of their minds, can change the outer aspects of their lives.

Wonder is the mother of all science.

Man is a universe in little.

There will be obstacles. There will be doubters. There will be mistakes. But with hard work, there are no limits.

A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing.

All men make mistakes, but a good man yields when he knows he knows his course is wrong and repairs the evil. The only crime is pride.

In school, you are given the lesson first. One the street, you're given the mistake first and then it's up to you to find the lesson, if you ever find it.

Feelings of worth can flourish only in an atmosphere where individual differences are appreciated, mistakes are tolerated, communication is open, and rules are flexible. The kind of atmosphere that is found in a nurturing family.

There is nothing so absurd or ridiculous that has not at some time been said by some philosopher.