"We must, therefore, be careful how we choose our pleasures, and how we avoid our pains."

"The wise man will not be miserable when he is old."

"It is better to endure a necessary pain than to suffer a constant anxiety."

"Empty is the argument of the philosopher by which no human suffering is therapeutically treated."

"Justice is a contract of utility entered into to prevent men from harming or being harmed by one another."