We hate the very idea that our own ideas may be mistaken, so we cling dogmatically to our conjectures.

Every solution of a problem raises new unsolved problems.

We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant.

We hate the very idea that our own ideas may be mistaken, so we cling dogmatically to our conjectures.

Philosophy is a necessary activity because we, all of us, take a great number of things for granted, and many of these assumptions are of a philosophical character; we act on them in private life, in politics, in our work, and in every other sphere of our lives -- but while some of these assumptions are no doubt true, it is likely, that more are false and some are harmful. So the critical examination of our presuppositions -- which is a philosophical activity -- is morally as well as intellectually important.

You cannot have a rational discussion with a man who prefers shooting you to being convinced by you.

Those who promise us paradise on earth never produced anything but a hell.