Origen
Catena Aurea · Matthäusevangelium 19
Then answered Peter and said unto him, Behold, we have forsaken all, and followed thee; what shall we have therefore? And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel. And every one that hath forsaken houses, or brethren, or sisters, or father, or mother, or wife, or children, or lands, for my name’s sake, shall receive an hundred fold, and shall inherit everlasting life. But many that are first shall be last; and the last shall be first.
By this He exhorts those that come late to the heavenly word, to haste to ascend to perfection before many whom they see to have grown old in the faith. This sense may also overthrow those that boast to have been educated in Christianity by Christian parents, especially if those parents have filled the Episcopal see, or the office of Priests or Deacons in the Church; and hinder them from desponding who have entertained the Christian doctrines more newly. It has also another meaning, the first, are the Israelites, who become last because of their unbelief; and the Gentiles who were last become first. He is careful to say, Many; for not all who are first shall be last, nor all last first. For before this have many of mankind, who by nature are the last, been made by an angelic life above the Angels; and some Angels who were first have been made last through their sin.