Space-ships and time machines are no escape from the human condition.

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

The principle that the end justifies the means is and remains the only rule of political ethics; anything else is just a vague chatter and melts away between one’s fingers.

...the temptation, which consisted of a single word written on the cemetary of the defeated: Sleep.

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

Creativity in science could be described as the act of putting two and two together to make five

The inner defenses are unconscious. They consist of a kind of magic aura which the mind builds around cherished belief. Arguments which penetrate into the magic aura are not dealt with rationally but by a specific type of pseudo-reasoning. Absurdities and contradictions are made acceptable by specious rationalizations.