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.
EpicurusWe must meditate on what brings happiness, since when it has, it has everything, and when he misses, we do everything to have it
EpicurusOf all the things which wisdom provides to make us entirely happy, much the greatest is the possession of friendship.
Epicurus