Law cost God but two tables of stone, and the engraving of ten commands upon them. An angel was a being of sufficient elevation to be the messenger of it to man.
Grace cost God the gift of His Son. It cost His Son a path of immeasurable sorrow and humiliation, and a death of unspeakable suffering. No being less than the Son of God could have accomplished what was required to bring grace to man. Only He was of sufficient elevation and worth to offer up a sacrifice by which He could lay one hand upon God and the other upon sinful man, and bring them together in a righteous, holy way, as grace does.
How few realize, when they repeat the Ten Commandments, that they are repeating their own sentence of death!
Christianity is a new creation flowing out of the death, resurrection and ascension into heaven of our
Lord Jesus Christ, and in the descent of the Holy Spirit to the earth. It is apostasy itself therefore to present it as a mere code of moral ethics, however superior to any other it may be claimed to be.