Aristotle, Nicomachean Ethics IX
“…so, friends properly desire spending time with one another. And whatever it is that is truly living for each and what they think makes life worth living, they want to share that with their friends. This is why some people drink together, others play dice together, some exercise together, or hunt, or study philosophy.
Each group of people spend their time together doing what they delight in most in life—because they want to share their lives with their friends, they join them and share in their pursuits as much as possible.”
ὥστ᾿ εἰκότως τούτου ἐφίενται. καὶ ὅ τι ποτ᾿ ἐστὶν ἑκάστοις τὸ εἶναι ἢ οὗ χάριν αἱροῦνται τὸ ζῆν, ἐν τούτῳ μετὰ τῶν φίλων βούλονται διάγειν· διάπερ οἱ μὲν συμπίνουσιν, οἱ δὲ συγκυβεύουσιν, ἄλλοι δὲ συγγυμνάζονται καὶ συγκυνηγοῦσιν ἢ συμφιλοσοφοῦσιν, ἕκαστοι ἐν τούτῳ συνημερεύοντες ὅ τί περ μάλιστα ἀγαπῶσι τῶν ἐν τῷ βίῳ· συζῆν γὰρ βουλόμενοι μετὰ τῶν φίλων, ταῦτα ποιοῦσι καὶ τούτων κοινωνοῦσιν ὡς οἷόν τε [συζῆν].