Piety, like nobility, has its aristocracy.

Science and art belong to the whole world, and before them vanish the barriers of nationality.

Girls we love for what they are; young men for what they promise to be.

What must the English and French think of the language of our philosophers when we Germans do not understand it ourselves?

He who does not stretch himself according to the coverlet finds his feet uncovered.

When intelligent and sensible people despise knowledge in their old age, it is only because they have asked too much of it and of themselves.

Battle not with monsters, for then you become one.