And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, [even] in his Son Jesus Christ. This is the true God, and eternal life.
Berean Study Bible (BSB) - 1 John 5:20 >And we know that the Son of God has come and has given us understanding, so that we may know Him who is true; and we are in Him who is true—in His Son Jesus Christ. He is the true God and eternal life.
Textus Receptus (TR) - 1 John 5:20 >Οἴδαμεν δὲ ὅτι ὁ υἱὸς τοῦ Θεοῦ ἥκει, καὶ δέδωκεν ἡμῖν διάνοιαν ἵνα γινώσκωμεν τὸν ἀληθινόν· καί ἐσμεν ἐν τῷ ἀληθινῷ, ἐν τῷ υἱῷ αὐτοῦ Ἰησοῦ Χριστῷ. Οὗτός ἐστιν ὁ ἀληθινὸς Θεός, καὶ ἡ ζωὴ αἰώνιος.