Why did Jesus perform miracles and signs?
Jesus performed miracles and signs to prove to the nation of Israel who He was—not merely another great man, but the Eternal Creator God who never stopped being God. His earthly ministry demonstrated His deity so Israel could understand that He was God in the womb, manger, growing years, and ministry.
Les explains that the whole concept of Jesus' earthly ministry was to prove to the nation of Israel who He was. That is why He performed miracles and signs—so they could understand that this was not just another great man, but the Eternal God. Les points out that Jesus never stopped being God: He was God in the womb, the manger, the growing-up years, and when He began His ministry. Les also notes that many cannot comprehend this, including Orthodox Jews who reject the Trinity, but we take it by faith, believing what God has said.