Everyone is a genius at least once a year.

The book which most deserved to be banned would be a catalog of banned books.

We are obliged to regard many of our original minds as crazy at least until we have become as clever as they are.

Delight at having understood a very abstract and obscure system leads most people to believe in the truth of what it demonstrates.

A good method of discovery is to imagine certain members of a system removed and then see how what is left would behave: for example, where would we be if iron were absent from the world: this is an old example.

Nothing makes one old so quickly as the ever-present thought that one is growing older.

The greatest events occur without intention playing any part in them; chance makes good mistakes and undoes the most carefully planned undertaking. The world's greatest events are not produced, they happen.