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.

Life and hope for the world are to be found only in the deeds of love.

I am firm; YOU are obstinate; HE is a pig-headed fool.

To save the world requires faith and courage: faith in reason, and courage to proclaim what reason shows to be true.

Mathematics is only the art of saying the same thing in different words.

The man who only loves beautiful things is dreaming, whereas the man who knows absolute beauty is wide awake.

To abandon the struggle for private happiness, to expel all eagerness of temporary desire, to burn with passion for eternal things-this is emancipation, and this is the free man's worship... United with his fellow men by the strongest of all ties, the tie of a common doom, the free man finds that a new vision is with him always, shedding over every daily task the light of love.