If you tried to doubt everything you would not get as far as doubting anything. The game of doubting itself presupposes certainty.

I don't know why we are here, but I'm pretty sure that it is not in order to enjoy ourselves.

One can defend common sense against the attacks of philosophers only by solving their puzzles, i.e., by curing them of the temptation to attack common sense.

The common behavior of mankind is the system of reference by means of which we interpret an unknown language.

Suppose someone were to say: 'Imagine this butterfly exactly as it is, but ugly instead of beautiful'?!

It is so characteristic, that just when the mechanics of reproduction are so vastly improved, there are fewer and fewer people who know how the music should be played.

An honest religious thinker is like a tightrope walker. He almost looks as though he were walking on nothing but air. His support is the slenderest imaginable. And yet it really is possible to walk on it.