Doubt everything at least once, even the sentence "Two times two is four."

To be content with life or to live merrily, rather all that is required is that we bestow on all things only a fleeting, superficial glance; the more thoughtful we become the more earnest we grow.

A sure sign of a good book is that you like it more the older you get.

Man can acquire accomplishments or he can become an animal, whichever he wants. God makes the animals, man makes himself.

Most subjects at universities are taught for no other purpose than that they may be re-taught when the students become teachers.

The highest level than can be reached by a mediocre but experienced mind is a talent for uncovering the weaknesses of those greater than itself.

Ambition and suspicion always go together.