11 Ἀγαπητοί, εἰ οὕτως ὁ Θεὸς ἠγάπησεν ἡμᾶς, καὶ ἡμεῖς ὀφείλομεν ἀλλήλους ἀγαπᾷν. 12 Θεὸν οὐδεὶς πώποτε τεθέαται· ἐὰν ἀγαπῶμεν ἀλλήλους, ὁ Θεὸς ἐν ἡμῖν μένει, καὶ ἡ ἀγάπη αὐτοῦ τετελειωμένη ἐστὶν ἐν ἡμῖν.
20 Ἐάν τις εἴπῃ ὅτι Ἀγαπῶ τὸν Θεόν, καὶ τὸν ἀδελφὸν αὐτοῦ μισῇ, ψεύστης ἐστίν· ὁ γὰρ μὴ ἀγαπῶν τὸν ἀδελφὸν αὐτοῦ ὃν ἑώρακε, τὸν Θεὸν ὃν οὐχ ἑώρακε πῶς δύναται ἀγαπᾷν; 21 Καὶ ταύτην τὴν ἐντολὴν ἔχομεν ἀπ᾿ αὐτοῦ, ἵνα ὁ ἀγαπῶν τὸν Θεόν, ἀγαπᾷ καὶ τὸν ἀδελφὸν αὐτοῦ.