The epistles of Peter are addressed to the elect Jews of his day, believing of course on the Lord Jesus, and scattered throughout a considerable portion of Asia Minor. The apostle takes particular care to instruct them in the bearing of many of the types that were contained in the Levitical ritual with which they were familiar. But while he contrasts the Christian position with their former Jewish one, in order to strengthen them as to their place and calling now in and by Christ, he takes care also to maintain fully whatever common truth there is between the Christian and the saints of the Old Testament. For it is hardly necessary to say to any intelligent believer, that whatever may be the new privileges, and consequently fresh duties which flow from them, there are certain unchangeable moral principles to which God holds throughout all time. These were insisted on in the Old Testament, particularly in the psalms and the prophets. And the apostle guards against the wrong conclusion, that, because in certain things we stand contrasted with the Old Testament saints, there are no grounds in common.
Let it then be well borne in mind, that God holds fast that which He has laid down for all that are His as to the moral government of God. That government may differ in character and depth; there may be at a fitting moment a far closer dealing with souls (as undoubtedly this is the case since redemption). At the same time the general principles of God are in no way enfeebled by Christianity, but rather strengthened and cleared immensely. Take, for instance, the duty of obedience; the value of a gracious, peaceful walk here below; the degree of confidence in God. It was ever right that love should go out towards others, whether in general kindness towards all mankind, or in special affections towards the family of God. These things were always true in principle, and never can be touched while man lives on earth.