Context: The Fourth Gospel — attributed to the apostle John — is theologically and literarily different from the Synoptics (Matthew, Mark, Luke). Written last (~90–100 AD), it is the most contemplative and theological, structured around selected signs and long dialogues/discourses that progressively reveal Jesus' divine identity.

The prologue (John 1:1–18): The most theologically dense opening in the Bible. "In the beginning was the Word (Logos), and the Word was with God, and the Word was God." The pre-existent Logos, agent of creation, became incarnate in human history — the doctrine of the Incarnation in its most explicit and philosophical formulation. The book's structure: the "Book of Signs" (chs. 1–12) with seven selected signs; and the "Book of Glory" (chs. 13–21) with the Upper Room discourses and the Passion-Resurrection.

The seven "I AM" statements: Declarations of divine identity that echo God's name in the OT (Exod 3:14): "I am the bread of life" (6:35), "the light of the world" (8:12), "the door" (10:9), "the good shepherd" (10:11), "the resurrection and the life" (11:25), "the way, and the truth, and the life" (14:6), "the true vine" (15:1). John 3:16 is probably the most memorized verse in the world.