What I cannot live with may not bother another man's conscience. The result is that conscience will stand against conscience.

No cause is left but the most ancient of all, the one, in fact, that from the beginning of our history has determined the very existence of politics, the cause of freedom versus tyranny.

Every thought is an afterthought.

Ideas, as distinguished from events, are never unprecedented.

To be sure, nothing is more important to the integrity of the universities . . . than a rigorously enforced divorce from war-oriented research and all connected enterprises.

If men were ever to lose the appetite for meaning we call thinking, they would lose the capacity for asking all the unanswerable questions upon which every civilization is founded.

The most radical revolutionary will become a conservative the day after the revolution.