It is humankind's duty to respect all life, not only animals have feelings but even also trees and plants.

No path leads from a knowledge of that which is to that which should be.

If only I had known, I should have become a watchmaker.

... one does people the best service by giving them some elevating work to do and thus indirectly elevating them.

Knowledge is realizing that the street is one way; wisdom is looking in both directions anyway.

I believe my theory of relativity to be true. But it will only be proved for certain in 1981, when I am dead.

There are actually two approaches to reside your daily life. One is as if absolutely nothing is really a miracle. The other is as if every little thing is a wonder