The doctrine of eternal Sonship declares that the second person of the triune godhead has eternally existed as the Son. There was never a time when he was not the Son of God. At the incarnation he became a man; he did not become the Son. Those who deny this foundational truth teach that Jesus became the Son of God at some point in history. Some say that he became the Son at his baptism; others at his resurrection. Most, however, say that he became...