The Eternal Generation of the Son — John 5:26

John 5:26 is a key text for eternal generation: "as the Father has life in himself, so he has granted the Son also to have life in himself." The Son's life is the Father's own life, eternally communicated.

Council of Nicaea — Nicene Creed, and Augustine — On the Trinity. Thomas Aquinas — Summa Theologiae.

The mutual life of Father and Son connects to the Logos who was with God in John 1:1 and to the radiance of God's glory in Heb 1:3. Generation is eternal, not an event within time.