At one point in his treatise against the ‘Gnostics’ Plotinus treats his adversaries as men of flesh and blood, not merely as proponents of false books and false beliefs: For I feel a certain shame with regard to some of my friends , who, having chanced upon this doctrine before the beginning of our friendship, have continued to adhere to it for reasons that I cannot understand. Not that they themselves show any compunction in saying what they say: they may (...) believe what they say to be true , but perhaps they rather wish others to be persuaded of the truth of their own opinions. (shrink)