There are almost no limits to the discoveries of how the human brain operates in illness and health, in sleep and waking and dreaming, in calm and under tension. The question is how far man can put these discoveries to use without using them not for cure but for power.

Science itself is a humanist in the sense that it doesn't discriminate between human beings, but it is also morally neutral. It is no better or worse than the ethos with and for which it is used.

There are some who become spies for money, or out of vanity and megalomania, or out of ambition, or out of a desire for thrills. But the malady of our time is of those who become spies out of idealism.

The crime of book purging is that it involves a rejection of the word. For the word is never absolute truth, but only man's frail and human effort to approach the truth. To reject the word is to reject the human search.

The problem of freedom in America is that of maintaining a competition of ideas, and you do not achieve that by silencing one brand of idea.

There are almost no limits to the discoveries of how the human brain operates in illness and health, in sleep and waking and dreaming, in calm and under tension. The question is how far man can put these discoveries to use without using them not for cure but for power.

Either men will learn to live like brothers, or they will die like beasts.