You can be healed of depression if every day you begin the first thing in the morning to consider how you will bring a real joy to someone else.

My difficulties belong to me!

In the company of friends, writers can discuss their books, economists the state of the economy, lawyers their latest cases, and businessmen their latest acquisitions, but mathematicians cannot discuss their mathematics at all. And the more profound their work, the less understandable it is.

The only worthwhile achievements of man are those which are socially useful.

What do you first do when you learn to swim? You make mistakes, do you not? And what happens? You make other mistakes, and when you have made all the mistakes you possibly can without drowning - and some of them many times over - what do you find? That you can swim? Well - life is just the same as learning to swim! Do not be afraid of making mistakes, for there is no other way of learning how to live!

War is not the continuation of politics with different means, it is the greatest mass-crime perpetrated on the community of man.

The truth is often a terrible weapon of aggression. It is possible to lie, and even to murder, with the truth.