In this treatise Luther also attacks for the first time the Roman doctrine of the mass as a bloodless repetition of the sacrifice once made on Calvary—a theory which forgets that the mass is a testament and a sacrament, in which God promises and gives something to us, not we to Him (sec. 19). In much stronger language, and quoting Scripture more extensively, Luther exposes and rejects this error, so fundamental to the Roman system, in his work of 1522, On the Abuse of the Mass. In the Babylonian Captivity he remarks, "When I published my Sermon of the Supper,[14] I was still caught in the prevailing conception, and was indifferent whether the pope was right or not." [15] In this treatise, then, we have the first clear statement of the reformer on this subject. It shows, however, the beautifully conservative character of Luther that even here, where he is compelled to reject the Roman sacrificial theory, we see him laboring to detect at least an element of scriptural truth in the refuted doctrine. He says (secs. 26, 27) that in the Supper we use Christ as our Sacrifice and Mediator, by bringing our prayer and thanksgiving to the Father through Him. And this furnishes the basis on which he builds the evangelical doctrine of the priesthood of all believers (sec. 28); alle Christenmänner Pfaffen, alle Weiber Pfaffinnen, es sei jung oder alt, etc. This is still more strongly emphasized in the Abuse of the Mass of 1522. Two more points need to be mentioned,—the withholding of the cup from the laity and the number of the sacraments. In the Sermon of 1519 Luther attaches little importance to the communion in both kinds, though he thinks it would be well for the Church in a General Council to restore the two elements to all Christians. But in this treatise of 1520 he is already beginning to use stronger language. He would like to know who gave the power to withhold the cup (sec. 34). In the Babylonian Captivity and in the Abuse of the Mass he unsparingly condemns the Roman practice. On the number of the sacraments, Luther seems not yet to have been entirely in the clear when he wrote this work. In Section 24 he mentions, besides baptism and the Lord's Supper, "confirmation, penance, extreme unction, etc." In the Babylonian Captivity he definitely reduces the seven sacraments of the Roman Church to baptism, the Lord's Supper and penance, but he had his doubts on this point before he wrote this present work, as we may conclude from a remark in the Sermon of 1519, in which he distinguishes "baptism and the bread" as the two "principal sacraments," and also from a letter to Spalatin,[16] in which he writes that no one need expect from him a publication on the other sacraments until he shall first have been taught by what passage of Scripture he may justify them.[17] In conclusion, it may be said that this whole Treatise on the New Testament is a beautiful illustration of the constructive power of Luther's work.