Thinking is easy, acting is difficult, and to put one's thoughts into action is the most difficult thing in the world.

One is never deceived; one deceives oneself.

The highest goal that man can achieve is amazement.

Don't give us your doubts, gives us your certainties, for we have doubts enough of our own.

For usually people resist as long as they can to dismiss the fool they harbor in their bosom, they resist to confess a major mistake or to admit a truth that makes them despair.

If you want to reach the infinite, then explore every aspect of the finite.

Everything is both simpler than we can imagine and more entangled than we can conceive.