Common sense is the collection of prejudices acquired by age eighteen.

All are lunatics, but he who can analyze his delusion is called a philosopher.

We are left with the indisputable but irritating conclusion: 0 = 0. This is a favourite device that mathematical equations resort to, when we propound stupid questions.

Science aims at constructing a world which shall be symbolic of the world of commonplace experience. It is not at all necessary that every individual symbol that is used should represent something in common experience or even something explicable in terms of common experience.

Not only is the universe stranger than we imagine, it is stranger than we can imagine.

The principles of logic and mathematics are true simply because we never allow them to be anything else.

In the end, it's not the years in your life that count. It's the life in your years.