Thus far Paul has spoken professedly on the authority of "the Lord." Next he contemplates the case of an existing union between a Christian and an unbeliever; and on his own judgment he admits a new ground of separation. "But to the rest speak I, not the Lord." The Christian may not put away or abandon his spouse on account of difference in religious faith. "For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they holy. But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases."[35] Again, through this last remark, the seeds of dissension are planted; for it is not clear whether the "bondage" from which the brother or sister is freed is that of the existing marriage or the irksome necessity of perpetual single life after separation.
Upon these Bible passages, often vague and puzzling in the extreme,[36] was eventually erected the whole doctrine of the mediæval church relating to divorce. It is not surprising that harmony was reached only after many centuries of struggle. With the exact processes of argument by which ingenious theologians have in all ages sought to reconcile or interpret the scriptural teaching we are here but little concerned. At present we are mainly interested in the general results of thought as they find expression in the law and practice of the church previous to the Reformation. The subject presents four phases or aspects of development, each of which will be briefly considered: the views of the early Fathers; the legislation of the Christian emperors; the compromise with Germanic custom; and the final settlement of doctrine in the canon law.
[Footnote 36: Thus AUGUSTINE (_De adult. conjug._) confesses the extreme difficulty of reconciling the scriptural texts relating to divorce and second marriage: "His ita pro meo modulo pertractatis atque discussis quaestionem tamen de conjugiis obscurissimam et implicatissimam esse, non nescio." On this FREISEN (_Geschichte des can. Eherechts_, 772, 773) remarks, "es wird ihm hierin gewiss jeder zustimmen, der die Worte der hl. Schrift durchliest."]
_b_) _Views of the early Fathers._--During the first four centuries of our era the so-called "strict" construction of the utterances of Jesus and Paul relating to the twofold question of separation and second marriage was formulated by the Fathers of the church; and the principles then agreed upon were in the end, after an intervening period of vacillation and compromise, to be accepted and elaborated into a complete system of law by the canonists. The literature of this early debate may be regarded as reaching from the Pastor of Hermas, a writer in the first half of the second century, highly respected in Christian antiquity,[37] to Augustine, late in the fourth century (died 430), who towers above all the other Fathers in his influence for good or evil in the history of European thought. At first the Pauline interdict of further marriage after separation receives more attention perhaps than the question of divorce itself, with its assigned cause as laid down by Jesus; for it is strongly urged that the chief evil of a too lax divorce system, such as the Roman, is the facility of second marriage regardless of the guilt or innocence of the parties.[38] Setting aside for the present the case of the Christian whose unbelieving spouse voluntarily departs--the _casus apostoli_ or _privilegium Paulinum_, as it is later styled by the canonists[39]--nearly all are agreed that divorce is forbidden except for the one cause mentioned by Matthew. There is, however, a divergence of view in two important particulars. On the one hand, certain writers, such as Tertullian and pseudo-Ambrose, following the principle of the Jewish law, admit this ground of repudiation to the advantage of the man, but not to that of the woman; while others, like Epiphanius, maintain the equal right of the sexes in this regard. On the other hand, in a few instances the word "adultery"[40] is accepted in an allegorical or spiritual sense, thus greatly widening the field of divorce. In this way, for example, Hermas, Hieronymus, and, for a time, Augustine anticipate the mode of interpretation adopted by some of the Reformation Fathers, admitting idolatry, apostasy, and covetousness, equally with carnal transgression, as proper grounds of separation.[41]