text: In answer to the letter which you wrote me while travelling, – a letter as long as the journey itself, – I shall reply later. I ought to go into retirement, and consider what sort of advice I should give you. For you yourself, who consult me, also reflected for a long time whether to do so; how much more, then, should I myself reflect, since more deliberation is necessary in settling than in propounding a problem! And this is particularly true when one thing is advantageous to you and another to me. Am I speaking again in the guise of an Epicurean? But the fact is, the same thing is advantageous to me which is advantageous to you; for I am not your friend unless whatever is at issue concerning you is my concern also. Friendship produces between us a partnership in all our interests. There is no such thing as good or bad fortune for the individual; we live in common. And no one can live happily who has regard to himself alone and transforms everything into a question of his own utility; you must live for your neighbour, if you would live for yourself. This fellowship, maintained with scrupulous care, which makes us mingle as men with our fellow-men and holds that the human race have certain rights in common, is also of great help in cherishing the more intimate fellowship which is based on friendship, concerning which I began to speak above. For he that has much in common with a fellow-man will have all things in common with a friend.