If the hammer and the shuttle could move themselves, slavery would be unnecessary.

Those who believe that all virtue is to be found in their own party principles push matters to extremes; they do not consider that disproportion destroys a state.

Injustice results as much from treating unequals equally as from treating equals unequally.

Now, the causes being four, it is the business of the student of nature to know about them all, and if he refers his problems back to all of them, he will assign the "why" in the way proper to his science-the matter, the form, the mover, that for the sake of which.

In painting, the most brilliant colors, spread at random and without design, will give far less pleasure than the simplest outline of a figure.

Art completes what nature cannot bring to finish. The artist gives us knowledge of nature's unrealized ends.

Your happiness depends on you alone.