imperative to explain one writing by another; the Pauline Epistles, for example, were to be interpreted by the Pastoral Epistles and the Acts of the Apostles.[100] Now was required what Tertullian calls the "mixture" of the Old and New Testaments,[101] in consequence of which the full recognition of the knowledge got from the old Bible was regarded as the first law for the interpretation of the new. The formation of the new collection into a canon was therefore an immediate and unavoidable necessity if doubts of all kinds were to be averted. These were abundantly excited by the exegesis of the heretics; they were got rid of by making the writings into a canon. Fifthly, the early Christian enthusiasm more and more decreased in the course of the second century; not only did Apostles, prophets, and teachers die out, but the religious mood of the majority of Christians was changed. A reflective piety took the place of the instinctive religious enthusiasm which made those who felt it believe that they themselves possessed the Spirit.[102] Such a piety requires rules; at the same time, however, it is characterised by the perception that it has not the active and spontaneous character which it ought to have, but has to prove its legitimacy in an indirect and "objective" way. The breach with tradition, the deviation from the original state of things is felt and recognised. Men, however, conceal from themselves their own defects, by placing the representatives of the past on an unattainable height, and forming such an estimate of their qualities as makes it unlawful and impossible for those of the present generation, in the interests of their own comfort, to compare themselves with them. When matters reach this point, great suspicion attaches to those who hold fast their religious independence and wish to apply the old standards. Not only do they seem arrogant and proud, but they also appear disturbers of the necessary new arrangement which has its justification in the fact of its being unavoidable. This development of the matter was, moreover, of the greatest significance for the history of the canon. Its creation very speedily resulted in the opinion that the time of divine revelation had gone past and was exhausted in the Apostles, that is, in the records left by them. We cannot prove with certainty that the canon was formed to confirm this opinion, but we can show that it was very soon used to oppose those Christians who professed to be prophets or appealed to the continuance of prophecy. The influence which the canon exercised in this respect is the most decisive and important. That which Tertullian, as a Montanist, asserts of one of his opponents: "Prophetiam expulit, paracletum fugavit" ("he expelled prophecy, he drove away the Paraclete"), can be far more truly said of the New Testament which the same Tertullian as a Catholic recognised. The New Testament, though not all at once, put an end to a situation