1 John 5:20

Finally, we have spiritual understanding through our anointing with the Holy Spirit (1 John 2:20) whom Jesus Christ sent (cf. 1 Corinthians 2:15-16). Consequently we can come to know God intimately and can abide in God and in His Son, Jesus Christ, who is the true God and eternal life (cf. John 14:6). The full title "His Son Jesus Christ" appears only at 1 John 1:3 as well as here in this epistle providing bookends for what John wrote (another inclusio). This verse contains one of the clearest announcements of the deity of Jesus Christ in the New Testament.

"Eternal life, for John, is a relationship with the Father and the Son. It begins in the present when a person comes to faith in Jesus Christ, but it continues uninterrupted into the age to come." [Note: Harris, p. 232.]