The most important part of teaching is to teach what it is to know.

Absolutely unmixed attention is prayer.

Renunciation is submission to time.

The proper method of philosophy consists in clearly conceiving the insoluble problems in all their insolubility and then in simply contemplating them, fixedly and tirelessly, year after year, without any hope, patiently waiting.

Petroleum is a more likely cause of international conflict than wheat.

The world is the closed door. It is a barrier. And at the same time it is the way through.

Whether the mask is labeled fascism, democracy, or dictatorship of the proletariat, our great adversary remains the apparatus—the bureaucracy, the police, the military. Not the one facing us across the frontier of the battle lines, which is not so much our enemy as our brothers' enemy, but the one that calls itself our protector and makes us its slaves. No matter what the circumstances, the worst betrayal will always be to subordinate ourselves to this apparatus and to trample underfoot, in its service, all human values in ourselves and in others.