Arithmetic is where numbers fly like pigeons in and out of your head.

Algebraic symbols are used when you do not know what you are talking about.

Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.

In mathematics, you don't understand things. You just get used to them.

Mathematics is like checkers in being suitable for the young, not too difficult, amusing, and without peril to the state.

Mathematics consists in proving the most obvious thing in the least obvious way.

Most likely, logic is capable of justifying mathematics to no greater extent than biology is capable of justifying life.