If you took half of something and continued to take half of that half and so on, you would never reach an end.

Nothing happens until something moves.

The more a man is imbued with the ordered regularity of all events the firmer becomes his conviction that there is no room left by the side of this ordered regularity for causes of a different nature. For him neither the rule of human nor the rule of divine will exist as an independent cause of natural events.

The State idea is not according to my heart. I cannot understand why it is needed. It is connected with narrow-minded and economic obstacles. I believe it is bad. I have always been against it.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

To my mind, to kill in war is not a whit better than to commit ordinary murder.

If you have never failed, you have never tried anything new.