Friendship is essentially a partnership.

Nature does nothing without a purpose. In children may be observed the traces and seeds of what will one day be settled psychological habits, though psychologically a child hardly differs for the time being from an animal.

You should never think without an image.

All flatterers are mercenary, and all low-minded men are flatterers.

Conscientious and careful physicians allocate causes of disease to natural laws, while the ablest scientists go back to medicine for their first principles.

That which is in locomotion must arrive at the half-way stage before it arrives at the goal.

The proof that the state is a creation of nature and prior to the individual is that the individual, when isolated, is not self-sufficing.