In my youth I regarded the universe as an open book, printed in the language of equations, whereas now it appears to me as a text written in invisible ink, of which in our rare moments of grace we are able to decipher a small segment.

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.

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 ultimate truth is penultimately always a falsehood. He who will be proved right in the end appears to be wrong and harmful before it.

The discoveries of yesterday are the truisms of tomorrow, because we can add to our knowledge but cannot subtract from it.

The 'gallows' are not only a symbol of death, but also a symbol of cruelty, terror and irreverence for life; the common denominator of primitive savagery, medieval fanaticism and modern totalitarianism.

If conquerors be regarded as the engine-drivers of History, then the conquerors of thought are perhaps the pointsmen who, less conspicuous to the traveler's eye, determine the direction of the journey.