Death tripped down the corridor, changing step, struck out here and there, danced pirouettes; often I felt his breath on my face when he was miles away; often I fell asleep and dreamed while he stood leaning over my bed.

The greatest temptation for the like of us is: to renounce violence, to repent, to make peace with oneself. Most revolutionaries fell before this temptation, from Spartacus to Danton and Dostoevsky; they are the classical form of betrayal of the cause. The temptations of God were always more dangerous for mankind than those of Satan. As long as chaos dominates the world, God is an anachronism; and every compromise with one’s own conscience is perfidy. When the accursed inner voice speaks to you, hold your hands over your ears….

I went to Communism as one goes to a spring of fresh water, and I left Communism as one clambers out of a poisoned river strewn with the wreckage of flooded cities and the corpses of the drowned.

Somebody once asked Niels Bohr why he had a horseshoe hanging above the front door of his house. Surely you, a world famous physicist, can't really believe that hanging a horseshoe above your door brings you luck? Of course not, Bohr replied, but I have been reliably informed that it will bring me luck whether I believe in it or not.

Hitherto man had to live with the idea of death as an individual; from now onward mankind will have to live with the idea of its death as a species.

Newton's apple and Cezanne's apple are discoveries more closely related than they seem.

Politics can be relatively fair in the breathing spaces of history; at its critical turning points there is no other rule possible than the old one, that the end justifies the means.