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.

One might call habit a moral friction: something that prevents the mind from gliding over things but connects it with them and makes it hard for it to free itself from them.

There are many who believe that 'Marriage is not a word - it is a sentence!' Whether you are indeed 'married' or if you are 'single', I am sure that funny quotes on weddings and marriages always tend to put a wicked smile to the face. It is often said that 'People who are married are often desperate to get out of it and people who are single can't wait to get in!'

Here take back the stuff that I am, nature, knead it back into the dough of being, make of me a bush, a cloud, whatever you will, even a man, only no longer make me.

One's first step in wisdom is to question everything - and one's last is to come to terms with everything.

The great trick of regarding small departures from the truth as the truth itself - on which is founded the entire integral calculus - is also the basis of our witty speculations, where the whole thing would often collapse if we considered the departures with philosophical rigour.

The most perfect ape cannot draw an ape; only man can do that; but, likewise, only man regards the ability to do this as a sign of superiority.