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CHAP. IX. and indissoluble connection of rights and duties, has acted as a wholesome corrective to the predispositions of writers who, if left to themselves, might have exclusively viewed a moral obligation as the public duty of a citizen in the Civitas Dei. But the amount of Roman Law in moral theology becomes sensibly smaller at the time of its cultivation by the great Spanish moralists. Moral theology, developed by the juridical method of doctor commenting on doctor, provided itself with a phraseology of its own, and Aristotelian peculiarities of reasoning and expression, imbibed doubtless in great part from the Disputations on Morals in the academical schools, take the place of that special turn of thought and speech which can never be mistaken by any person conversant with the Roman law. If the credit of the Spanish school of moral theologians had continued, the juridical ingredient in ethical science would have been insignificant, but the use made of their conclusions by the next generation of Roman Catholic writers on these subjects almost entirely destroyed their influence. Moral Theology, degraded into Casuistry, lost all interest for the leaders of European speculation; and the new science of Moral Philosophy, which was entirely in the hands of the Protestants, swerved greatly aside from the path which the moral theologians had followed. The effect was vastly to increase the influence of Roman law on ethical inquiry.