15 Why need I count up all those who have been called to Himself by God and associated with such wonders as confirmed him in his piety? Nor was it the case that after such and so incredible and startling beginnings, any of the former things was put to shame by his subsequent conduct, as happens with those who very soon acquire a distaste for what is good, and so neglect all further progress, if they do not utterly relapse into vice. This cannot be said of him, for he was most consistent with himself and his early days, and kept in harmony his life before the priesthood with its excellence, and his life after it with what had gone before, since it would have been unbecoming to begin in one way and end in another, or to advance to a different end from that which he had in view at first.
He was next entrusted with the priesthood, not with the facility and disorder of the present day, but after a brief interval, in order to add to his own cleansing the skill and power to cleanse others; for this is the law of spiritual sequence. And when he had been entrusted with it, the grace was the more glorified, being really the grace of God, and not of men, and not, as the preacher says, an independent impulse and purpose of spirit.
Source: Orations (New Advent)