No doctor of the church did more than St. Jerome to impose the rule of celibacy on its members, yet even he admits that at the beginning there was no absolute injunction to that effect; and he endeavors to apologize for the admission by arguing that infants must be nourished with milk and not with solid food.[17] In the middle of the eleventh century, during the controversy between Rome and Constantinople, Rome had no scruple in admitting that the celebrated text of St. Paul (_I. Cor. ix. 5_) meant that the apostles were married, though subsequent commentators have exhausted so much ingenuity in explaining it away.[18] A century later Gratian, the most learned canonist of his time, in the “Decretum,” undertaken at the request of the papal court, which has ever since maintained its position as the standard of the canon law, felt no hesitation in admitting that, before the adoption of the canon, marriage was everywhere undisturbed among those in orders, as it continued to be in the Greek church.[19] The reputation of St. Thomas Aquinas as a theologian was as unquestioned as that of Gratian as a canonist, and the Angelic Doctor admitted as freely as the canon lawyer that compulsory celibacy was an innovation on the rules of the primitive church, which he endeavors to explain by an argument contradictory to that of St. Jerome, for he says that the greater sanctity of the earlier Christians rendered them superior to the asceticism requisite to the purity of a degenerate age, even as no modern warrior could emulate the exploit of Samson in throwing himself amid a hostile army with no other weapon than a jaw-bone. He even admits, what other authorities have denied, that Christ required no separation between St. Peter and his wife.[20] There were in the thirteenth and fourteenth centuries few more learned men than Giraldus Cambrensis, whose orthodoxy was unquestioned, and who, as Archdeacon of St. David’s, vigorously sought to enforce the rule of continence upon his recalcitrant clergy. Yet in a strenuous exhortation to them to mend the error of their ways in this respect, he admits that clerical celibacy has no scriptural or apostolic warrant.[21] That this was universally admitted at the time is manifested by Alfonso the Wise, of Castile, about the middle of the thirteenth century, asserting the fact in the most positive manner, while forbidding marriage to the priests of his dominions, in the code known as Las Siete Partidas.[22]