Origen

“ It is possible, indeed, that when he has first begun to fall away, and to yield to the corrupting influence of a negligence which is small as yet, he may, if he be aroused and return speedily to his senses, repair those losses which up to that time are only recent, and recover that knowledge which hitherto had been only slightly obliterated from his mind. ”

“ According to our point of view, then, so long as that geometer or physician continues to exercise himself in the study of his art and in the practice of its principles, the knowledge of his profession abides with him; but if he withdraw from its practice, and lay aside his habits of industry, then, by his neglect, at first a few things will gradually escape him, then by and by more and more, until in course of time everything will be forgotten, and be completely effaced from the memory. ”

“ But in our desire to show the divine benefits bestowed upon us by Father, Son, and Holy Spirit, which Trinity is the fountain of all holiness, we have fallen, in what we have said, into a digression, having considered that the subject of the soul, which accidentally came before us, should be touched on, although cursorily, seeing we were discussing a cognate topic relating to our rational nature. ”