Now may our God and Father himself, and our Lord Jesus Christ, direct our way to you;
 The next portion, or second half of the epistle, opens with practical exhortation. The early part insists on purity; then follow a few words on love. It might seem strange that it should be needful to guard these saints, walking as we have seen so simply and delightfully, against unclean offences even in the closest relations of life that Christian men should be warned against fornication and adultery; but we know that so desperate is the evil of the flesh, that no circumstances nor position can secure, yea, even the joy of the blessing of God's grace, without * exercise of conscience and self-judgment; and hence these solemn admonitions from the Lord. It was particularly needed at that time and in Greece, because such sins were rather sanctioned than judged in the heathen world. Even mankind in later days have profited enormously by the change. They can now no doubt enrich themselves with truth, and talk largely about holiness; but how little they knew of either before they borrowed from Scripture! it is all stolen goods, every bit of real value. The men of whom they are the successors were unclean to the last degree. The Aristotles and Platos were really not fit for decent company. I admit our Grecians would scowl at such an estimate, or scorn it; but they lack the elements for forming an adequate moral appraisal, or they do not look the facts in the face, plain enough as they are. If knowingly they endorse or make light of such morals as Plato counted desirable for his republic, it cannot be doubted where they themselves are. Undoubtedly there were some fine speculations, but nothing more; for men thought that talking about morality would do as well as the thing itself. It is Christ, and Christ alone, that has brought in the very truth of God in word and deed. It was unknown to man before: still more the ultimate proof in the cross that He is love. Christ first displayed absolute purity in the very nature which had revelled in lust and passion heretofore.
