Church Father, Origen, re everlasting (aionios) punishment (Mt.25:46) being temporary:
“That threats of aionios punishment are helpful for those immature who abstain from evil out of fear and not for love is repeated, e.g. in CC 6,26: “it is not helpful to go up to what will come beyond that punishment, for the sake of those who restrain themselves only with much difficulty, out of fear of the aionios punishment”; Hom. in Jer. 20 (19), 4: for a married woman it is better to believe that a faithless woman will undergo aionios punishment and keep faithful, rather than knowing the truth and becoming disloyal;” (p.178-9).
Ilaria Ramelli, The Christian Doctrine of Apokatastasis: A Critical Assessment from the New Testament to Eriugena (Brill, 2013. 890 pp.)
CHURCH FATHERS: Contra Celsus, Book VI (Origen)
newadvent.org/fathers/04166.htm
Furthermore, Origen seems to see “eternal fire” (Mt.25:41) as remedial, corrective & temporary:
“Chapter 10. On the Resurrection, and the Judgment, the Fire of Hell, and Punishments.”
“1. But since the discourse has reminded us of the subjects of a future judgment and of retribution, and of the punishments of sinners, according to the threatenings of holy Scripture and the contents of the Church’s teaching— viz., that when the time of judgment comes, everlasting fire, and outer darkness, and a prison, and a furnace, and other punishments of like nature, have been prepared for sinners— let us see what our opinions on these points ought to be.”
“…nevertheless in such a way, that even the body which rises again of those who are to be destined to everlasting fire or to severe punishments, is by the very change of the resurrection so incorruptible, that it cannot be corrupted and dissolved even by severe punishments. If, then, such be the qualities of that body which will arise from the dead, let us now see what is the meaning of the threatening of eternal fire.”
“…And when this dissolution and rending asunder of soul shall have been tested by the application of fire, a solidification undoubtedly into a firmer structure will take place, and a restoration be effected.”
[De Principis Book 2]
newadvent.org/fathers/04122.htm
Links to the Works of Origen in English, Greek, and Latin
john-uebersax.com/plato/origen2.htm