This question touches on the deep and profound mystery of the Trinity which is central to Christian doctrine. The Bible presents God as one Being in three Persons: God the Father, God the Son (Jesus Christ), and the Holy Spirit. These three are distinct yet coexist in unity, sharing the same essence or substance.

In John 1:1, it is written, “In the beginning was the Word, and the Word was with God, and the Word was God.” This verse introduces Jesus (referred to as the “Word”) as divine, sharing in the essence of God. Yet, the same chapter reveals the incarnation: “And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth” (John 1:14). This shows Jesus as God who became human, living among us as the Son of God.

Furthermore, in the Gospel of John, Jesus himself speaks about his unique relationship with the Father, saying, “I and the Father are one” (John 10:30). This illustrates the unity within the Trinity, emphasizing that Jesus is indeed God and at the same time the Son of God.

Philippians 2:6-7 also gives insight, stating that Jesus, “though he was in the form of God, did not count equality with God a thing to be grasped, but emptied himself, by taking the form of a servant, being born in the likeness of men.” This passage speaks to the mystery of Jesus being fully God and fully man—God the Son, who humbled himself to become a human being.

Understanding the Trinity and the dual nature of Christ as fully God and fully man is a profound mystery that has been contemplated by theologians throughout the ages. It’s a core belief that asserts Jesus’s divinity and his unique sonship with God, enabling him to be the perfect mediator between God and humanity.