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

With the truth, all given facts harmonize; but with what is false, the truth soon hits a wrong note.

Boundaries don't protect rivers, people do.

Character gives us qualities, but it is in our actions — what we do — that we are happy or the reverse.

Knowing yourself is the beginning of all wisdom.

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.

Wise people have an inward sense of what is beautiful, and the highest wisdom is to trust this intuition and be guided by it.