Sameness leaves us in peace but it is contradiction that makes us productive.

I believe in God and in nature and in the triumph of good over evil.

Everything has been thought of before, but the problem is to think of it again.

At all times it has not been the age, but individuals alone, who have worked for knowledge. It was the age which put Socrates to death by poison, the age which burnt Huss. The ages have always remained alike.

Always to distrust is an error, as well as always to trust.

I hate every violent overthrow, because as much is destroyed as is gained by it.

Stones are mute teachers; they silence the observer, and the most valuable lesson we learn from them we cannot communicate.