Letters 9.8

Let us now return to the question. The wise man, I say, self-sufficient though he be, nevertheless desires friends if only for the purpose of practising friendship, in order that his noble qualities may not lie dormant. Not, however, for the purpose mentioned by Epicurus in the letter quoted above: “That there may be someone to sit by him when he is ill, to help him when he is in prison or in want;” but that he may have someone by whose sick-bed he himself may sit, someone a prisoner in hostile hands whom he himself may set free. He who regards himself only, and enters upon friendships for this reason, reckons wrongly. The end will be like the beginning: he has made friends with one who might assist him out of bondage; at the first rattle of the chain such a friend will desert him.

Seneca, Letters to Lucilius 9.8, translated by Richard Mott Gummere