In the writings of Tertullian a conception of Christianity is quite fully developed according to which the Gospel was a new law of life, with its prescribed holy seasons and hours for prayer; its sacrifices, though as yet only sacrifices of prayer; its fasts and almsgiving, which had propitiatory effect, atoning for sins committed and winning merit with God; its sacred rites, solemnly administered by an established hierarchy; and all observed for the sake of a reward which God in justice owed those who kept His commandments. It is noticeable that already there is the same divided opinion as to marriage, whereby, on the one hand, it was regarded as a concession to weakness, a necessary evil, and, on the other, a high and holy relation, strictly monogamous, and of abiding worth. The propitiatory and meritorious character of fasts and almsgiving as laid down by Tertullian was developed even further by Cyprian and became a permanent element in the penitential system of the Church, ultimately affecting its conception of redemption. (_a_) Tertullian, _De Oratione_, 23, 25, 28. (MSL, 1:1298.) Ch. 23. As to kneeling, also, prayer is subject to diversity of observance on account of a few who abstain from kneeling on the Sabbath. Since this dissension is particularly on its trial before the churches, the Lord will give His grace that the dissentients may either yield or else follow their own opinion without offence to the others. We, however, as we have received, only on the Sunday of the resurrection ought to guard not only against this kneeling, but every posture and office of anxiety; deferring even our businesses, lest we give any place to the devil. Similarly, too, the period of Pentecost, is a time which we distinguish by the same solemnity of exultation. But who would hesitate every day to prostrate himself before God, at least in the first prayer with which we enter on the daylight? At fasts, moreover, and stations, no prayer should be made without kneeling and the remaining customary marks of humility. For then we are not only praying, but making supplication, and making satisfaction to our Lord God. Ch. 25. Touching the time, however, the extrinsic observance of certain hours will not be unprofitable; those common hours, I mean, which mark the intervals of the day—the third, the sixth, the ninth—which we may find in Scripture to have been more solemn than the rest. Ch. 28. This is the spiritual victim which has abolished the pristine sacrifices.… We are the true adorers and true priests, who, praying in the spirit, in the spirit sacrifice prayer, proper and acceptable to God, which, assuredly, He has required, which He has looked forward to for Himself. This victim, devoted from the whole heart, fed on faith, tended by truth, entire in innocence, pure in chastity, garlanded with love [agape], we ought to escort with the pomp of good works, amid psalms and hymns, unto God’s altar, to obtain all things from God for us.