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

I wanted to change the world. But I have found that the only thing one can be sure of changing is oneself.

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.

Having a great intellect is no path to being happy.

For we walk by faith, not by sight

The most courageous act is still to think for yourself. Aloud.

It is easy to be brave at a safe distance.

Nobody made a greater mistake than he who did nothing because he could do only a little.

The greatest deception men suffer is from their own opinions.

As our case is new, we must think and act anew.

Most of what matters in our lives takes place in our absence.

We are all born ignorant, but one must work hard to remain stupid

Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more

The one you buy will be the only one that doesn't work.

At the center of your being you have the answer; you know who you are and you know what you want.

I don't know, I don't care, and it doesn't make any difference.

No man has any natural authority over his fellow men.

It seems essential, in relationships and all tasks, that we concentrate only on what is most significant and important.

If you would take, you must first give, this is the beginning of intelligence.

In the midst of movement and chaos, keep stillness inside of you.

There's no sense in being precise when you don't even know what you're talking about.