A clever child brought up with a foolish one can itself become foolish. Man is so perfectible and corruptible he can become a fool through good sense.

A book which, above all others in the world, should be forbidden, is a catalogue of forbidden books.

To err is human also in so far as animals seldom or never err, or at least only the cleverest of them do so.

God: personified incomprehensibility.

Honest unaffected distrust of human abilities under all circumstances is the surest sign of strength of mind.

If you are going to build something in the air it is always better to build castles than houses of cards.

The course of the seasons is a piece of clockwork, with a cuckoo to call when it is spring.