Man must suffer to be wise.
Your enemies can kill you, but only your friends can hurt you.
The greater the difficulty, the greater the glory.
Quacks pretend to cure other men's disorders, but fail to find a remedy for their own.
A dissolute and intemperate youth hands down the body to old age in a worn-out state.
For my own part, I had rather be old only a short time than be old before I really am so.