Even a fool is wise after an event.

Heroism on command, senseless violence, and all the loathsome nonsense that goes by the name of patriotism - how passionately I hate them!

Keep on sowing your seed, for you never know which will grow - perhaps it all will.

Man's will, sustained by an indominable conviction, is much more powerful than material forces that seem insurmountable.

I have never obtained any ethical values from my scientific work.

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.

It takes a touch of genius - and a lot of courage to move in the opposite direction.