[22] for what can be a greater act of wickedness than to think that the unchangeable God can be changed? And this, too, while some persons think that even those who are really men do never hesitate in their opinions, for that those, who have studied philosophy in a sincere and pure spirit, have derived as the greatest good arising from their knowledge, the absence of any inclination to change with the changes of affairs, and the disposition, with all immovable firmness and sure stability, to labour at every thing that it becomes them to pursue.