Doubt is the origin of wisdom

Wisdom begins at the end.

A man who as a physical being is always turned toward the outside, thinking that his happiness lies outside him, finally turns inward and discovers that the source is within him.

You always admire what you really don't understand.

The noblest pleasure is the joy of understanding.

A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.

But the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright brothers. But they also laughed at Bozo the Clown.

You have heard that it was said, 'Eye for eye, and tooth for tooth.' But I tell you, do not resist an evil person. If someone strikes you on the right cheek, turn to him the other also.

No one can make you feel inferior without your consent.

Be curious, not judgmental.

The only real laughter comes from despair.

I hear and I forget. I see and I remember. I do and I understand.

And this sensitivity will create new friendships for you - friendships with trees, with birds, with animals, with mountains, with rivers, with oceans, with stars. Life becomes richer as love grows.

Never ruin an apology with an excuse.

Although our intellect always longs for clarity and certainty, our nature often finds uncertainty fascinating.

Circumstances do not make a man, they reveal him.

The use of travelling is to regulate imagination by reality, and instead of thinking how things may be, to see them as they are.

Each problem that I solved became a rule which served afterwards to solve other problems.

Don't criticize what you can't understand.

One must wait until the evening to see how splendid the day has been.

The cure for pain is in the pain.