Of all forms of mental activity, the most difficult to induce even in the minds of the young, who may be presumed not to have lost their flexibility, is the art of handling the same bundle of data as before, but placing them in a new system of relations with one another by giving them a different framework, all of which virtually means putting on a different kind of thinking-cap for the moment. It is easy to teach anybody a new fact...but it needs light from heaven above to enable a teacher to break the old framework in which the student is accustomed to seeing.

The purposiveness of all vital processes, the strategy of the genes and the power of the exploratory drive in animal and man, all seem to indicate that the pull of the future is as real as the pressure of the past.

Learn from the mistakes of others. You can't live long enough to make them all yourself. Boredom sets into boring minds. The more original a discovery, the more obvious it seems afterwards.

History knows no scruples and no hesitation. Inert and unerring, she flows towards her goal. At every bend in her course she leaves the mud which she carries and the corpses of the drowned.

In the social equation, the value of a single life is nil; in the cosmic equation, it is infinite... Not only communism, but any political movement which implicitly relies on purely utilitarian ethics, must become a victim to the same fatal error. It is a fallacy as naïve as a mathematical teaser, and yet its consequences lead straight to Goya's Disasters, to the reign of the guillotine, the torture chambers of the Inquisition, or the cellars of the Lubianka.

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.

No writer or teacher or artist can escape the responsibility of influencing others whether he intends to or not, whether he is conscious of it or not.