To say of what is that it is not, or of what is not that it is, is false, while to say of what is that it is, and of what is not that it is not, is true.

By 'life,' we mean a thing that can nourish itself and grow and decay.

Most people would rather give than get affection.

Be a free thinker and don't accept everything you hear as truth. Be critical and evaluate what you believe in.

Some men turn every quality or art into a means of making money; this they conceive to be the end, and to the promotion of the end all things must contribute.

All three states - the Lacedaemonian, the Cretan, and the Carthaginian - nearly resemble one another, and are very different from any others. Many of the Carthaginian institutions are excellent. The superiority of their constitution is proved by the fact that the common people remains loyal to the constitution; the Carthaginians have never had any rebellion worth speaking of, and have never been under the rule of a tyrant.

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