That same eternal God and Father, who by grace alone chose us in his Son Christ Jesus before the foundation of the world was laid, appointed him to be our head, our brother, our pastor, and the great bishop of our souls. But since the opposition between the justice of God and our sins was such that no flesh by itself could or might have attained unto God, it behooved the Son of God to descend unto us and take himself a body of our body, flesh of our flesh, and bone of our bone, and so become the Mediator between God and man, giving power to as many as believe in him to be the sons of God; as he himself says, “I ascend to my Father and to your Father, to my God and to your God.”
By this most holy brotherhood whatever we have lost in Adam is restored to us again. Therefore we are not afraid to call God our Father, not so much because he has created us [which we have in common with the reprobate] as because he has given unto us his only Son to be our brother, and given us grace to acknowledge and embrace him as our only Mediator.
Further, it behooved the Messiah and Redeemer to be true God and true man, because he was able to undergo the punishment of our transgressions and to present himself in the presence of his Father’s judgment, as in our stead, to suffer for our transgression and disobedience, and by death to overcome him that was the author of death. But because the Godhead alone could not suffer death, and neither could manhood overcome death, he joined both together in one person, that the weakness of one should suffer and be subject to death—which we had deserved—and the infinite and invincible power of the other, that is, of the Godhead, should triumph, and purchase for us life, liberty, and perpetual victory. So we confess, and most undoubtedly believe.
The Scots Confession of 1560, 3.08