Origen

“ Now here Celsus appears to me to have committed a great error, in refusing to those who are sinners by nature, and also by habit, the possibility of a complete transformation, alleging that they cannot be cured even by punishment. For it clearly appears that all men are inclined to sin by nature, [1] and some not only by nature but by practice, while not all men are incapable of an entire transformation. ”

“ For there are found in every philosophical sect, and in the word of God, persons who are related to have undergone so great a change that they may be proposed as a model of excellence of life. Among the names of the heroic age some mention Hercules and Ulysses, among those of later times, Socrates, and of those who have lived very recently, Musonius. ”