“… 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. And because you are sons, God has sent the Spirit of his Son into our hearts, crying, ‘Abba! Father!’ So you are no longer a slave, but a son, and if a son, then an heir through God.” (Gal 4:4-7)
God’s Son existed before Jesus was born. The events that we remember at Christmas were when, as Paul describes it, “the fullness of time had come”. The angels that visited Mary and Joseph, and appeared to the Shepherds, announced that the time had come.
The time had come for God to send forth his Son. Note Paul doesn’t say that when the time came God decided to have a child, or that his Son was born. He says God “sent forth” his Son. His Son existed before Jesus was born. As we saw in Hebrews 1 and Colossians 1, and we’ll see in other passages, the Son of God existed before the world was created. And in fact, he was involved in the creation of the universe.
But when the time came, the time all history had been working up to, the Son of God was “sent forth” and “born of a woman” – i.e. made fully human. He was “under the law” – as fully human he wasn’t exempt from any of God’s commands.
And God sent his Son, so that “we might receive the adoption as sons.” I’ve written before on how wonderful it is to have God as our Father. God is infinitely strong and infinitely wise. It gives us great confidence and reassurance to know that God is our Faith. But also, being sons makes us heirs. And therefore we look forward to eternal life as an inheritance. It’s not just a promise, it’s a binding contract
God, when the way had been prepared, when the right time came – the time we remember at Christmas – sent his Son into the world, to make us sons and put us in line for the greatest inheritance possible.