I answer that, As stated above (A. 1), it belongs to the virtue of fortitude to remove any obstacle that withdraws the will from following the reason. Now to be withdrawn from something difficult belongs to the notion of fear, which denotes withdrawal from an evil that entails difficulty, as stated above (I-II, Q. 42, AA. 3, 5) in the treatise on passions. Hence fortitude is chiefly about fear of difficult things, which can withdraw the will from following the reason. And it behooves one not only firmly to bear the assault of these difficulties by restraining fear, but also moderately to withstand them, when, to wit, it is necessary to dispel them altogether in order to free oneself therefrom for the future, which seems to come under the notion of daring. Therefore fortitude is about fear and daring, as curbing fear and moderating daring.
Reply Obj. 1: Gregory is speaking then of the fortitude of the just man, as to its common relation to all virtues. Hence he first of all mentions matters pertaining to temperance, as in the words quoted, and then adds that which pertains properly to fortitude as a special virtue, by saying: "To love the trials of this life for the sake of an eternal reward."
Reply Obj. 2: Dangers and toils do not withdraw the will from the course of reason, except in so far as they are an object of fear. Hence fortitude needs to be immediately about fear and daring, but mediately about dangers and toils, these being the objects of those passions.
Reply Obj. 3: Hope is opposed to fear on the part of the object, for hope is of good, fear of evil: whereas daring is about the same object, and is opposed to fear by way of approach and withdrawal, as stated above (I-II, Q. 45, A. 1). And since fortitude properly regards those temporal evils that withdraw one from virtue, as appears from Tully's definition quoted in the Second Objection, it follows that fortitude properly is about fear and daring and not about hope, except in so far as it is connected with daring, as stated above (I-II, Q. 45, A. 2). _______________________
FOURTH ARTICLE [II-II, Q. 123, Art. 4]
Whether Fortitude Is Only About Dangers of Death?
Objection 1: It seems that fortitude is not only about dangers of death. For Augustine says (De Morib. Eccl. xv) that "fortitude is love bearing all things readily for the sake of the object beloved": and (Music. vi) he says that fortitude is "the love which dreads no hardship, not even death." Therefore fortitude is not only about danger of death, but also about other afflictions.
Obj. 2: Further, all the passions of the soul need to be reduced to a mean by some virtue. Now there is no other virtue reducing fears to a mean. Therefore fortitude is not only about fear of death, but also about other fears.
Obj. 3: Further, no virtue is about extremes. But fear of death is about an extreme, since it is the greatest of fears, as stated in Ethic. iii. Therefore the virtue of fortitude is not about fear of death.
On the contrary, Andronicus says that "fortitude is a virtue of the irascible faculty that is not easily deterred by the fear of death."