Envy is the ulcer of the soul.
We can do nothing without the body, let us always take care that it is in the best condition to sustain us.
Are not all things which have opposites generated out of their opposites?
Wonder is the beginning of wisdom.
The really important thing is not to live, but to live well. And to live well meant, along with more enjoyable things in life, to live according to your principles.
Do not do to others what angers you if done to you by others.