"In an age of religious fervor, the most artful statesmen are observed to feel some part of the enthusiasm which they inspire; and the most orthodox saints assume the dangerous privilege of defending the cause of truth by the arms of deceit and falsehood. Personal interest is often the standard of our belief, as well as of our practice; and the same motives of temporal advantage which might influence the public conduct and professions of Constantine, would insensibly dispose his mind to embrace a religion so propitious to his fame and fortunes. ...As real virtue is sometimes excited by undeserved applause, the specious piety of Constantine, if at first it was only specious, might gradually, by the influence of praise, of habit, and of example, be matured into serious faith and fervent devotion."

—Edward Gibbon, Decline and Fall of the Roman Empire, Vol. II