Thomas Aquinas

“ It seems that presumption is not opposed to magnanimity by excess. For presumption is accounted a species of the sin against the Holy Ghost, as stated above (Q [14] , A [2] ; Q [21] , A [1] ) . But the sin against the Holy Ghost is not opposed to magnanimity, but to charity. Neither therefore is presumption opposed to magnanimity.
Objection 2: Further, it belongs to magnanimity that one should deem oneself worthy of great things. But a man is said to be presumptuous even if he deem himself worthy of small things, if they surpass his ability. ”

“ Again, the thing to which a man sometimes tends in excess of his ability, is sometimes in very truth something great, simply as in the case of Peter, whose intent was to suffer for Christ, which has exceeded his power; while sometimes it is something great, not simply, but only in the opinion of fools, such as wearing costly clothes, despising and wronging others. This savors of an excess of magnanimity, not in any truth, but in people's opinion. ”

“ Divine and immortal things surpass man according to the order of nature. Yet man is possessed of a natural power, namely the intellect, whereby he can be united to immortal and Divine things. In this respect the Philosopher says that "man ought to pursue immortal and divine things," not that he should do what it becomes God to do, but that he should be united to Him in intellect and will. ”

“ First only as regards quantity, as when a man thinks he has greater virtue, or knowledge, or the like, than he has. Secondly, as regards the kind of thing, as when he thinks himself great, and worthy of great things, by reason of something that does not make him so, for instance by reason of riches or goods of fortune. For, as the Philosopher says (Ethic. iv, 3) , "those who have these things without virtue, neither justly deem themselves worthy of great things, nor are rightly called magnanimous." ”

“ Thus too it would be sinful and presumptuous for a man while in a state of imperfect virtue to attempt the immediate accomplishment of what belongs to perfect virtue. But it is not presumptuous or sinful for a man to endeavor to advance towards perfect virtue. In this way the Apostle stretched himself forth to the things that were before him, namely continually advancing forward. ”