Don't limit a child to your own learning, for he was born in another time.

I would maintain that thanks are the highest form of thought, and that gratitude is happiness doubled by wonder.

The superior man understands what is right the inferior man understands what will sell.

In books lies the soul of the whole past time.

In theory there is no difference between theory and practice. In practice there is.

The best way to convince a fool that he is wrong is to let him have his own way.