7. But spiritual sacrifices, Peter tells us, are acceptable to God; and Paul teaches the same (Rom 8, 13): "If by the Spirit ye put to death the deeds of the body, ye shall live." Paul speaks of mortifying through the Spirit; Peter, of a spiritual sacrifice. The offering must first be slain. Paul's thought is: "If ye mortify the deeds of the body in your individual, chosen ways, unprompted by the Spirit or your own heart, simply through fear of punishment, that mortification--that sacrifice--will be carnal; and ye shall not live, but die a death the more awful." The Spirit must mortify your deeds--spiritually it must be done; that is, with real enjoyment, unmoved by fear of hell, voluntarily, without expectation of meriting honor or reward, either temporal or eternal. This, mark you, is a spiritual sacrifice. However outward, gross, physical and visible a deed may be, it is altogether spiritual when wrought by the Spirit. Even eating and drinking are spiritual works if done through the Spirit. On the other hand, whatsoever is wrought through the flesh is carnal, no matter to what extent it may be a secret desire of the soul. Paul (Gal 5, 20) terms idolatry and heresies works of the flesh, notwithstanding they are invisible impulses of the soul. 8. In addition to this spiritual sacrifice--the mortifying of the deeds of the body--Peter mentions another, later on in the same chapter: "But ye are ... a royal priesthood ... that ye may show forth the excellencies of him who called you out of darkness into his marvelous light." Here Peter touches upon the preaching office, the real sacrificial office, concerning which it is said (Ps 50, 23), "Whoso offereth the sacrifice of thanksgiving glorifieth me." Preaching extols the grace of God. It is the offering of praise and thanks. Paul boasts (Rom 15, 16) that he sanctifies and offers the Gospel. But it is not our purpose to consider here this sacrifice of praise; though praise in the congregation may be included in the spiritual sacrifice, as we shall see. For he who offers his body to God also offers his tongue and his lips as instruments to confess, preach and extol the grace of God. On this topic, however, we shall speak elsewhere. Let us now consider the words of the text. OUR SPIRITUAL SERVICE. "I beseech you therefore, brethren." 9. Paul does not say, "I command you." He is preaching to those already godly Christians through faith in the new man; to hearers who are not to be constrained by commandments, but to be admonished. For the object is to secure voluntary renunciation of their old, sinful, Adam-like nature. He who will not cheerfully respond to friendly admonition is no Christian. And he who attempts by the restraints of law to compel the unwilling to renunciation, is no Christian preacher or ruler; he is but a worldly jailer. "By the mercies of God."