A Sceptick therefore, who because he finds that Truths are not universally received, doubts of their existence, is just as foolish as a man who should try large shoes upon little feet, and little shoes upon large feet, and finding that they did not f

I hate mankind, for I think myself one of the best of them, and I know how bad I am

When it occurs to a man that nature does not regard him as important, and that she feels she would not maim the universe by disposing of him, he at first wishes to throw bricks at the temple, and he hates deeply the fact that there are no bricks and no temples.

Homo sapiens, the only creature endowed with reason, is also the only creature to pin its existence on things unreasonable

Some day science may have the existence of mankind in power, and the human race can commit suicide by blowing up the world.

We have overcome the notion that mathematical truths have an existence independent and apart from our own minds. It is even strange to us that such a notion could ever have existed.