It is, in fact, nothing short of a miracle that the modern methods of instruction have not yet entirely strangled the holy curiosity of inquiry; for this delicate little plant, aside from stimulation, stands mainly in need of freedom; without this it goes to wrack and ruin without fail. It is a grave mistake to think that the enjoyment of seeing and searching can be promoted by means of coercion and a sense of duty.

Have the courage to take your own thoughts seriously, for they will shape you.

If only I had known, I should have become a watchmaker.

God does not play dice.

I have deep faith that the principle of the universe will be beautiful and simple

I very rarely think in words at all. A thought comes, and I may try to express in words afterwards.

Love is not the stupidest thing a man does, but it cannot be blamed on gravity.