I am neither an optimist nor pessimist, but a possibilist.

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.

The taste of democracy becomes a bitter taste when the fullness of democracy is denied.

Next to the striking of fire and the discovery of the wheel, the greatest triumph of what we call civilization was the domestication of the human male.

Man must be at once more humble and more confident; more humble in the face of destructive potentials of what he can achieve, more confident of his own humanity as against computers and robots which are only engines to simulate him.

Some of the more fatuous flag-waving Americans are in danger of forgetting that you can't extract gratitude as you would extract a tooth; that unless friendship is freely given, it means nothing and less than nothing.

In societies like the American and West European where the dynamics of energy come from freedom and where the climate and the whole ethos are those of freedom, censorship is bound to be at worst, stupid; at best, futile; and always, to some degree, inconsonant with the character of the society as a whole.