The question next arises: How does the recipient of the sign (body and blood under bread and wine) become partaker of that which is thereby signified? It is through faith, as the receiving organ (sec. 13). So, too, in the Sermon of 1519, where it is called the "third part of the sacrament," "in which the power lies" (wo die Macht anliegt). At a later time Luther found it necessary to emphasize the fact that it is not through the faith of the recipient that the sacrament gains its power and efficacy, since this attaches to it simply by virtue of the Word[12]; but that faith is the receiving organ for the blessing of the sacrament is a conviction which he never gave up. The object of faith is the Gospel, i. e., the promise of the forgiveness of sins contained in the Words of Institution, which are a "testament," a "new and eternal testament" (secs. 5-10). Hence the title of the work, Treatise on the New Testament. While the Sermon of 1519 speaks of the Gospel only in general, we have here a special emphasis on the words of institution as embracing "in a short summary" the whole Gospel (sec. 33). The words of institution are still further emphasized and interpreted in the work On Abuse of the Mass, of 1522. Because of the importance of the Word in the sacrament, Luther declares that the words of institution should be spoken aloud, not whispered, as was and is done in the Roman churches, and in a language which is understood by the people (sec. 16). An especially striking feature of this treatise is the repeated assertion that faith, which leans on the Word, and is the "principal part of the mass," does not absolutely need the sacrament. "I can daily enjoy the sacrament in the mass if only I keep before my eyes the testament, that is, the words and covenant of Christ, and feed and strengthen my faith thereby" (sec. 17) [13]. He quotes Augustine: "Only believe, so hast thou already partaken of the sacrament." In interpreting this passage we must remember that Luther was writing at a time when he was daily expecting to hear that the pope had excommunicated him from the Church. His comfort was that he and his followers could not be excluded by papal dictum from the communion of true believers and saints, nor deprived of the spiritual feeding upon the true spiritual body of Christ.