Knowledge exists in two forms - lifeless, stored in books, and alive, in the consciousness of men. The second form of existence is after all the essential one; the first, indispensable as it may be, occupies only an inferior position.

We all try to escape pain and death, while we seek what is pleasant.

Do you believe in miracles? Well, you should. In fact, life itself is a big miracle. There are so many things that are beyond our understanding. There are two ways to live: you can live as if nothing is a miracle; you can live as if everything is a miracle.

The true definition of madness is repeating the same action, over and over, hoping for a different result.

Man would indeeded be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.

Nothing will benefit human health and increase the chances for survival of life on Earth as much as the evolution to a vegetarian diet.

To be sure, it is not the fruits of scientific research that elevate a man and enrich his nature, but the urge to understand, the intellectual work, creative or receptive.