Aren't you ashamed, you who walk backward along the whole path of existence, and blame me for walking backward along the path of the promenade?

One original thought is worth a thousand mindless quotings

The foundation of every state is the education of its youth.

Man is the most intelligent of the animals - and the most silly.

I do not know whether there are gods, but there ought to be.

It is not that I am mad, it is only that my head is different from yours.

I am not an Athenian or a Greek, but a citizen of the world.