We celebrate today the birth of Jesus. The Word became flesh. He is God incarnate. It is hard to underestimate the significance of this. Pastor Sinclair Ferguson explains:
By his incarnation the Son of God became one with us, sharing our nature. he came 'made in human likeness' (Phil. 2:7), 'in the likeness of the flesh of sin' (Rom. 8:3). These are difficult words to interpret, but they appear to suggest that in his conception Christ really took hold of our nature in the womb of the virgin Mary, sanctified it through the Spirit, and lived out his life of obedience in the weakness of our flesh. He came truly to brother us, and to be tempted in all points as we are so that he might sympathise with us in our weakness (Heb. 4:15). Furthermore, he established this bridge between God and us in our flesh in order that he might come into contact with our sin, being 'made sin' for us (2 Cor. 5:21). We are united to him by divine covenant and also by divine incarnation. Our union with Christ is therfore based on Christ's union with us.
Merry Christmas!