For me, my thoughts are my prostitutes.

You risk just as much in being credulous as in being suspicious.

Doctors are always working to preserve our health and cooks to destroy it, but the latter are the more often successful.

As long as the centuries continue to unfold, the number of books will grow continually, and one can predict that a time will come when it will be almost as difficult to learn anything from books as from the direct study of the whole universe. It will be almost as convenient to search for some bit of truth concealed in nature as it will be to find it hidden away in an immense multitude of bound volumes.

I feel, I think, I judge; therefore, a part of organized matter like me is capable of feeling, thinking, and judging.

The most dangerous madmen are those created by religion, and people whose aim is to disrupt society always know how to make good use of them on occasion.

Isn't it better to have men being ungrateful than to miss a chance to do good?