But when the fullness of time had come, God sent forth his Son, born of
woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons. (Galatians 4:4-5 ESV)
"So the divinity of Christ, the humanity of Christ and the righteousness of Christ uniquely qualified Him to be man's redeemer. If He had not been man, He could not have redeemed men. If He had not been a righteous man, He could not have redeemed unrighteous men. And if He had not been God's Son, He could not have redeemed men for God or made them the sons of God."