Living virtuously is equal to living in accordance with one's experience of the actual course of nature - Chrysippus of Soli

He who is running a race ought to endeavor and strive to the utmost of his ability to come off victor; but it is utterly wrong for him to trip up his competitor, or to push him aside. So in life it is not unfair for one to seek for himself what may accrue to his benefit; but it is not right to take it from another.

We should infer in the case of a beautiful dwelling-place that it was built for its owners and not for mice; we ought, therefore, in the same way to regard the universe as the dwelling-place of the gods.

If I knew that it was fated for me to be sick, I would even wish for it; for the foot also, if it had intelligence, would volunteer to get muddy.