The most convincing proof of this is that Origen (i) takes the idea of the immutability of God as the regulating idea of his system, and (2) deprives the historical "Word made flesh" of all significance for the true Gnostic. To him Christ appears simply as the Logos who is with the Father from eternity, and works from all eternity, to whom alone the instructed Christian directs his thoughts, requiring nothing more than a perfect - i.e.
The immutability of God requires the eternity of the Logos and of the world.
He alone did not obey the law of immutability in the enchanted, sleeping castle.
Buffon (1753-1778), at first a partisan of the absolute immutability of species, subsequently appears to have believed that larger or smaller groups of species have been produced by the modification of a primitive stock; but he contributed nothing to the general doctrine of evolution.
The pre-existence of souls is another inference from the immutability of God.