Enchiridion · §43

πᾶν πρᾶγμα δύο ἔχει λαβάς, τὴν μὲν φορητήν, τὴν δὲ ἀφόρητον. ὁ ἀδελφός σου ἐὰν ἀδικῇ, μὴ λάμβανε αὐτὸ ἀπὸ τῆς λαβῆς, ὅτι ἀδικεῖ (αὕτη γάρ ἐστιν ἡ λαβή, ἣ οὐ φέρεται), ἀλλ᾽ ἀπὸ τῆς ἑτέρας, ὅτι ἀδελφός ἐστιν, ὅτι συνετράφη· καὶ εὑρήσεις αὐτὸ φορητὸν ὑπὸ τῆς φορητῆς λαβῆς.

pan pragma duo echei labas, tēn men phorētēn, tēn de aphorēton. ho adelphos sou ean adikē, mē lambane auto apo tēs labēs, hoti adikei (hautē gar estin hē labē, hē ou pheretai), all' apo tēs heteras, hoti adelphos estin, hoti sunetraphē; kai heurēseis auto phorēton hupo tēs phorētēs labēs.

Every situation has two handles — one by which it can be carried, and one by which it cannot. If your brother wrongs you, do not take hold of the situation by the handle of 'he wronged me' — that handle is unbearable. Instead take it by the other handle: 'he is my brother, we grew up together.' By the bearable handle, you will find the situation can in fact be carried.

— Enchiridion 43

Source: Greek (Schenkl/Oldfather critical edition tradition) + Long 1877 English translation