Now, of the two thoughts which I have said are involved in this great keyword, the former is common to Christianity, with all noble systems of morality, whether religious or irreligious. It is a commonplace, on which I do not need to dwell, that every man who will live a man's life, and not that of a beast, must sacrifice the flesh, and rigidly keep it down. But that commonplace is lifted into an altogether new region, assumes a new solemnity, and finds new power for its fulfilment when we add to the moralist's duty of control of the animal and outward nature the other thought, that the surrender must be to God. There is no need for my dwelling at any length on the various practical directions in which this great exhortation must be wrought out. It is of more importance, by far, to have well fixed in our minds and hearts the one dominant thought that sacrifice is the keyword of the Christian life than to explain the directions in which it applies. But still, just a word or two about these. There are three ways in which we may look at the body, which the Apostle here says is to be yielded up unto God. It is the recipient of impressions from without. _There_ is a field for consecration. The eye that looks upon evil, and by the look has rebellious, lustful, sensuous, foul desires excited in the heart, breaks this solemn law. The eye that among the things seen dwells with complacency on the pure, and turns from the impure as if a hot iron had been thrust into its pupil; that in the things seen discerns shimmering behind them, and manifested through them, the things unseen and eternal, is the consecrated eye. 'Art for Art's sake,' to quote the cant of the day, has too often meant art for the flesh's sake. And there are pictures and books, and sights of various sorts, flashed before the eyes of you young men and women which it is pollution to dwell upon, and should be pain to remember. I beseech you all to have guard over these gates of the heart, and to pray, 'Turn away mine eyes from viewing vanity.' And the other senses, in like manner, have need to be closely connected with God if they are not to rush us down to the devil.