Nothing is softer or more flexible than water, yet nothing can resist it.

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

If we know exactly where we're going, exactly how to get there, and exactly what we'll see along the way, we won't learn anything.

There are two educations. One should teach us how to make a living and the other how to live.

If you do what you've always done, you'll get what you've always gotten.

He alone is free who lives with free consent under the entire guidance of reason.

Experience is the only prophecy of wise men.

Judge a man by his questions rather than by his answers.

Nothing fixes a thing so intensely in the memory as the wish to forget it.

What a liberation to realize that the “voice in my head” is not who I am. Who am I then? The one who sees that.

Don't criticize what you can't understand.

The very essence of instinct is that it's followed independently of reason.

It is always advisable to perceive clearly our ignorance.

Time flies over us, but leaves its shadow behind.

There are four ways, and only four ways, in which we have contact with the world. We are evaluated and classified by these four contacts: what we do, how we look, what we say, and how we say it.

A precedent embalms a principle.

No one can make you feel inferior without your consent.

The only limit to our realization of tomorrow will be our doubts of today.

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact

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

Nobody has the power to take two steps together; you can take only one step at a time.