Thomas Aquinas

“ But that he fear none of these things cannot result from an entire lack of love, but only from the fact that he thinks it impossible for him to be afflicted by the evils contrary to the goods he loves. ”

“ It seems that fearlessness is not opposed to fortitude. For we judge of habits by their acts. Now no act of fortitude is hindered by a man being fearless: since if fear be removed, one is both brave to endure, and daring to attack. Therefore fearlessness is not opposed to fortitude.
Objection 2: Further, fearlessness is a vice, either through lack of due love, or on account of pride, or by reason of folly. Now lack of due love is opposed to charity, pride is contrary to humility, and folly to prudence or wisdom. Therefore the vice of fearlessness is not opposed to fortitude. ”

“ The vice of daring is opposed to fortitude by excess of daring, and fearlessness by deficiency of fear. Fortitude imposes the mean on each passion. Hence there is nothing unreasonable in its having different extremes in different respects. ”