A book is a mirror; if an ass peers into it, you can not expect an apostle to peer out.

A person reveals his character by nothing so clearly as the joke he resents.

Don't judge a man by his opinions, but what his opinions have made of him.

Everyone is a genius at least once a year. The real geniuses simply have their bright ideas closer together.

First there is a time when we believe everything, then for a little while we believe with discrimination, then we believe nothing whatever, and then we believe everything again ...

He who is in love with himself has at least this advantage - he won't encounter many rivals.

I cannot say whether things will get better if we change; what I can say is they must change if they are to get better.

Judge men not by their opinions, but by what their opinions have made of them.

Nothing is more conducive to peace of mind than not having any opinions at all.

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