From a Letter from Augustine to Dioscorus:

33. The Platonists, however, who, amidst the errors of false philosophies assailing them at that time on all sides, rather concealed their own doctrine to be searched for than brought it into the light to be vilified, as they had no divine personage to command faith, began to exhibit and unfold the doctrines of Plato after the name of Christ had become widely known to the wondering and troubled kingdoms of this world. Then flourished at Rome the school of Plotinus, which had as scholars many men of great acuteness and ability. But some of them were corrupted by curious inquiries into magic, and others, recognising in the Lord Jesus Christ the impersonation of that essential and immutable Truth and Wisdom which they were endeavouring to reach, passed into His service. Thus the whole supremacy of authority and light of reason for regenerating and reforming the human race has been made to reside in the one saving Name, and in His one Church.