Next to enjoying ourselves, the next greatest pleasure consists in preventing others from enjoying themselves, or, more generally, in the acquisition of power.

Love is something far more than desire for sexual intercourse; it is the principal means of escape from the loneliness which afflicts most men and women throughout the greater part of their lives.

Men are born ignorant, not stupid. They are made stupid by education.

A happy life must be to a great extent a quiet life, for it is only in an atmosphere of quiet that true joy dare live.

I suggest to young professors that their first work should be written in a jargon only to be understood by the erudite few. With that behind them, they can ever after say what they have to say in a language 'understand of the people.'

Whether science-and indeed civilization in general-can long survive depends upon psychology, that is to say, it depends upon what human beings desire.

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.