A theory is something nobody believes, except the person who made it. An experiment is something everybody believes, except the person who made it.

To get to know a country, you must have direct contact with the earth. It's futile to gaze at the world through a car window.

I have just got a new theory of eternity.

You cannot love a car the way you love a horse. The horse brings out human feelings the way machines cannot do. Things like machines may develop or neglect certain things in people ... Machines make our life impersonal and stultify certain elements in us and create an impersonal environment.

Arrows of hate have been aimed at me too, but they have never hit me, because somehow they belonged to another world with which I have no connection whatsoever.

Whatever your problems in math are, I assure mine are greater.

Teaching should be such that what is offered is perceived as a valuable gift and not as a hard duty.