5. But take diligent heed, etc He thus releases and frees them from temporary service, that he may bind them for ever to the authority of the one true God. He therefore permits them to return home, but on the condition that wherever they may be they are to be the soldiers of God; and he at the same time prescribes the mode, namely, the observance of his Law. But since such is the vanity and inconstancy of the human mind, that religion easily fades away from the heart, while carelessness and contempt creep in, he requires of them zeal and diligence in executing the Law. He calls it the Law of Moses, that they may not be carried to and fro by airy speculations, but remain fixed in the doctrine which they had learned from the faithful servant of God. He touches also on the end and sum of the Law, love to God, and adherence to him, because outward worship would otherwise be of little value. He confirms the same thing by other words, by which sincerity is denoted, namely, serving the Lord with their whole heart and soul.