In addition to his munificent patronage of the clergy, Constantine was himself deeply interested in all theological affairs and discussions. He convened and presided over the celebrated Council of Nicaea, or Nice, as it is usually called, composed of three hundred and eighteen bishops, and of two thousand and forty-eight ecclesiastics of lesser note, listening to their debates and following their suggestions. The Christian world never saw a more imposing spectacle than this great council, which was convened to settle the creed of the Church. It met in a spacious basilica, where the emperor, arrayed in his purple and silk robes, with a diadem of precious jewels on his head, and a voice of gentleness and softness, and an air of supreme majesty, exhorted the assembled theologians to unity and concord.
The vital question discussed by this magnificent and august assembly was metaphysical as well as religious; yet it was the question of the age, on which everybody talked, in public and in private, and which was deemed of far greater importance than any war or any affair of State. The interest in this subject seems strange to many, in an age when positive science and material interests have so largely crowded out theological discussions. But the doctrine of the Trinity was as vital and important in the eyes of the divines of the fourth century as that of Justification by Faith was to the Germans when they assembled in the great hall of the Electoral palace of Leipsic to hear Luther and Dr. Eck advocate their separate sides.
In the time of Constantine everything pertaining to Christianity and the affairs of the Church became invested with supreme importance. All other subjects and interests were secondary, certainly among the Christians themselves. As redemption is the central point of Christianity, public preaching and teaching had been directed chiefly, at first, to the passion, death, and resurrection of the Saviour of the world. Then came discussions and controversies, naturally, about the person of Christ and his relation to the Godhead. Among the early followers of our Lord there had been no pride of reason and a very simple creed. Least of all did they seek to explain the mysteries of their faith by metaphysical reasoning. Their doctrines were not brought to the test of philosophy. It was enough for these simple and usually unimportant and unlettered people to accept generally accredited facts. It was enough that Christ had suffered and died for them, in his boundless love, and that their souls would be saved in consequence. And as to doctrines, all they sought to know was what our Lord and his apostles said. Hence there was among them no system of theology, as we understand it, beyond the Apostles' Creed. But in the early part of the second century Justin Martyr, a converted philosopher, devoted much labor to a metaphysical development of the doctrine drawn from the expressions of the Apostle John in reference to the Logos, or Word, as identical with the Son.