The God Revealing Jesus in John

No one has seen God at any time; the only begotten God who is in the bosom of the Father, He has explained Him.

—John 1:18 (NASB)

According to John's gospel, therefore, God is characterized by Jesus, and once one has understood the gospel's characterization of Jesus, one has understood its characterization of God.

—Andreas J. Köstenberger, A Theology of John's Gospel and Letters, 361.