“Let whoever can do so deceive me, he will never bring it about that I am nothing, so long as I continue to think I am something.”

Doubt is the origin of wisdom.

It is not enough to have a good mind; the main thing is to use it well.

I took especially great pleasure in mathematics because of the certainty and the evidence of its arguments.

Mind and soul of the man is entirely different from the body.

So far, I have been a spectator in this theatre which is the world, but I am now about to mount the stage, and I come forward masked.

With me, everything turns into mathematics.

In order to seek truth, it is necessary once in the course of our life to doubt, as far as possible, of all things

Except our own thoughts, there is nothing absolutely in our power.

I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.

In order to improve the mind, we ought less to learn than to contemplate.

I think; therefore I am.

To live without philosophizing is in truth the same as keeping the eyes closed without attempting to open them.

If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.

Bad books engender bad habits, but bad habits engender good books.

Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.

Nothing is made from nothing.

The Prophets! And they were the closest to Allah. Every hardship is good for you-if it brings you closer to Him!

Simple kindness may be the most vital key to the riddle of how human beings can live with each other in peace…and care properly for this planet we all share.

You can’t control the world, but when you control your thoughts, you bring order.

And it did seem to me that one way that we could bring the apartheid regime down would be if we did mount an effective investment sanction.

Our workers, our American people who are already struggling, are going to continue to struggle until we can get somebody who can bring some business sense to Washington D.C., and I think that is the one thing I bring.

An artist should… bring into the world some vision. Dancers should ask, “What is their work in the service of?”

Courage is being willing to do the impossible because it is the right thing to do.

I know patients who bring a dozen roses to the doctor’s office. And, boy, the next visit, nobody forgets that. You come in and hey – ‘Here’s the lady who brought the roses’ vs. ‘Here’s the lung cancer.’