Hence it is evident that fortitude is a virtue, in so far as it conforms man to reason.
Reply Obj. 1: The virtue of the soul is perfected, not in the infirmity of the soul, but in the infirmity of the body, of which the Apostle was speaking. Now it belongs to fortitude of the mind to bear bravely with infirmities of the flesh, and this belongs to the virtue of patience or fortitude, as also to acknowledge one's own infirmity, and this belongs to the perfection that is called humility.
Reply Obj. 2: Sometimes a person performs the exterior act of a virtue without having the virtue, and from some other cause than virtue. Hence the Philosopher (Ethic. iii, 8) mentions five ways in which people are said to be brave by way of resemblance, through performing acts of fortitude without having the virtue. This may be done in three ways. First, because they tend to that which is difficult as though it were not difficult: and this again happens in three ways, for sometimes this is owing to ignorance, through not perceiving the greatness of the danger; sometimes it is owing to the fact that one is hopeful of overcoming dangers—when, for instance, one has often experienced escape from danger; and sometimes this is owing to a certain science and art, as in the case of soldiers who, through skill and practice in the use of arms, think little of the dangers of battle, as they reckon themselves capable of defending themselves against them; thus Vegetius says (De Re Milit. i), "No man fears to do what he is confident of having learned to do well." Secondly, a man performs an act of fortitude without having the virtue, through the impulse of a passion, whether of sorrow that he wishes to cast off, or again of anger. Thirdly, through choice, not indeed of a due end, but of some temporal advantage to be obtained, such as honor, pleasure, or gain, or of some disadvantage to be avoided, such as blame, pain, or loss.
Reply Obj. 3: The fortitude of the soul which is reckoned a virtue, as explained in the Reply to the First Objection, is so called from its likeness to fortitude of the body. Nor is it inconsistent with the notion of virtue, that a man should have a natural inclination to virtue by reason of his natural temperament, as stated above (I-II, Q. 63, A. 1). _______________________
SECOND ARTICLE [II-II, Q. 123, Art. 2]
Whether Fortitude Is a Special Virtue?
Objection 1: It seems that fortitude is not a special virtue. For it is written (Wis. 7:7): "She teacheth temperance, and prudence, and justice, and fortitude," where the text has "virtue" for "fortitude." Since then the term "virtue" is common to all virtues, it seems that fortitude is a general virtue.
Obj. 2: Further, Ambrose says (De Offic. i): "Fortitude is not lacking in courage, for alone she defends the honor of the virtues and guards their behests. She it is that wages an inexorable war on all vice, undeterred by toil, brave in face of dangers, steeled against pleasures, unyielding to lusts, avoiding covetousness as a deformity that weakens virtue"; and he says the same further on in connection with other vices. Now this cannot apply to any special virtue. Therefore fortitude is not a special virtue.
Obj. 3: Further, fortitude would seem to derive its name from firmness. But it belongs to every virtue to stand firm, as stated in Ethic. ii. Therefore fortitude is a general virtue.
On the contrary, Gregory (Moral. xxii) numbers it among the other virtues.