Energy cannot be created or destroyed, it can only be changed from one form to another.

Do not grow old, no matter how long you live.

... the desire for truth must take precedence over all other desires.

My success wasn't so much due to intelligence, but the fact that I stuck with problems longer.

Something deeply hidden had to be behind things.

At the same time, as social beings, we are moved in the relations with our fellow beings by such feelings as sympathy, pride, hate, need for power, pity, and so on.

Make everything as simple as possible, but not simpler. A man should look for what is, and not for what he thinks should be. We cannot solve our problems with the same thinking we used when we created them. A question that sometimes drives me hazy: am I or are the others crazy? Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction. All religions, arts and sciences are branches of the same tree. It's not that I'm so smart, it's just that I stay with problems longer.