Καὶ αὐτὴ εἶναι ἡ ἐντολή του: νὰ πιστέψωμεν εἰς τὸ ὄνομα τοῦ Υἱοῦ αὐτοῦ Ἰησοῦ Χριστοῦ καὶ νὰ ἀγαπᾶμε ὁ ἕνας τὸν ἄλλον, σύμφωνα μὲ τὴν ἐντολὴν ποὺ μᾶς ἔδωκε.