According to Epicurus, for example, “Vain is the word of a philosopher which does not heal any suffering of man. For just as there is no profit in medicine if it does not expel the diseases of the body, so there is no profit in philosophy either, if it does not expel the suffering of the mind.”1
Seneca, about whom I will have much to say in this book, “He who studies with a philosopher should take away with him some one good thing every day: he should daily return home a sounder man, or on the way to become sounder.”