Every great study is not only an end in itself, but also a means of creating and sustaining a lofty habit of mind. - Bertrand Russell

The wise man will be as happy as circumstances permit, and if he finds the contemplation of the universe painful beyond a point, he will contemplate something else instead.

Machines deprive us of two things which are certainly important ingredients of human happiness, namely, spontaneity and variety.

Ordinary language is totally unsuited for expressing what physics really asserts, since the words of everyday life are not sufficiently abstract. Only mathematics and mathematical logic can say as little as the physicist means to say.