inalienable objective standards, the adoption even of this greatest innovation, which indeed was in complete harmony with the secular element within her, was an elementary necessity. In regard to every sphere of Church life, and hence also in respect to the development of dogma[266] and the interpretation of the Holy Scriptures, the priesthood proved of the highest significance. The clerical exposition of the sacred books, with its frightful ideas, found its earliest advocate in Cyprian and had thus a most skilful champion at the very first.[267] II. SACRIFICE. In Book I., chap. III., Sec. 7, we have already shown what a wide field the idea of sacrifice occupied in primitive Christendom, and how it was specially connected with the celebration of the Lord's Supper. The latter was regarded as the pure (i.e., to be presented with a pure heart), bloodless thank offering of which Malachi had prophesied in I. 11. Priesthood and sacrifice, however, are mutually conditioned. The alteration of the concept "priest" necessarily led to a simultaneous and corresponding change in the idea of sacrifice, just as, conversely, the latter reacted on the former.[268] In Irenaeus and Tertullian the old conception of sacrifice, viz., that prayers are the Christian sacrifice and that the disposition of the believer hallows his whole life even as it does his offering, and forms a well-pleasing sacrifice to God, remains essentially unchanged. In particular, there is no evidence of any alteration in the notion of sacrifice connected with the Lord's Supper.[269] But nevertheless we can already trace a certain degree of modification in Tertullian. Not only does he give fasting, voluntary celibacy, martyrdom, etc., special prominence among the sacrificial acts of a Christian life, and extol their religious value--as had already been done before; but he also attributes a God-propitiating significance to these performances, and plainly designates them as "merita" ("promereri deum"). To the best of my belief Tertullian was the first who definitely regarded ascetic performances as propitiatory offerings and ascribed to them the "potestas reconciliandi iratum deum."[270] But he himself was far from using this fatal theory, so often found in his works, to support a lax Church practice that made Christianity consist in outward forms. This result did not come about till the eventful decades, prolific in new developments, that elapsed between the persecutions of Septimius and Decius; and in the West it is again Cyprian who is our earliest witness as to the new view and practice.[271] In the first place, Cyprian was quite familiar with the idea of ascetic propitiations and utilised it in the interest of the Catholicity of the Church; secondly, he propounded a new theory of the offering in the cultus. As far as the first point is concerned, Cyprian's injunctions with regard to it are everywhere based on the understanding that even after baptism no one can be without sin (de op.