Trinity; rejected the doctrine of the necessity of every event and named free will as a concurring cause in conversion. The doctrine of justification received its forensic form and the necessity of good works was emphasized in the interest of moral discipline. The last editions are distinguished from the earlier ones by the prominence given to the theoretical and rational element. As moralist In ethics Melanchthon preserved and renewed the tradition of ancient morality and represented the Protestant conception of life. His books bearing directly on morals were chiefly drawn from the classics, and were influenced not so much by Aristotle as by Cicero. His principal works in this line were Prolegomena to Cicero's De officiis (1525); Enarrationes librorum Ethicorum Aristotelis (1529); Epitome philosophiae moralis (1538); and Ethicae doctrinae elementa (1550). In his Epitome philosophiae moralis Melanchthon first considers the relation of philosophy to the law of God and the Gospel. Moral principles are knowable in the light of reason. Melanchthon calls these the law of God, and being endowed in human nature by God, so also the law of nature. The virtuous pagans had not yet developed the ideas of Original Sin and the Fall, or the fallen aspect of human nature itself, and so could not articulate or explain why humans did not always act virtuously. If virtue was the true law of human nature (having been put there by God himself) than the light of reason could only by darkened by sin. The revealed law, necessitated because of sin, is distinguished from natural law only by its greater completeness and clearness. The fundamental order of moral life can be grasped also by reason; therefore the development of moral philosophy from natural principles must not be neglected. Melanchthon therefore made no sharp distinction between natural and revealed morals. His contribution to Christian ethics in the proper sense must be sought in the Augsburg Confession and its Apology as well as in his Loci, where he followed Luther in depicting the Protestant ideal of life, the free realization of the divine law by a personality blessed in faith and filled with the spirit of God. As exegete Melanchthon's formulation of the authority of Scripture became the norm for the following time. The principle of his hermeneutics is expressed in his words: "Every theologian and faithful interpreter of the heavenly doctrine must necessarily be first a grammarian, then a dialectician,