Thomas Aquinas

“ Consequently pursuit of evil follows pursuit of good; and avoidance of good follows avoidance of evil. Now these four things belong to four passions, since pursuit of good belongs to hope, avoidance of evil to fear, the pursuit of the fearful evil belongs to daring, and the avoidance of good to despair. It follows, therefore, that daring results from hope; since it is in the hope of overcoming the threatening object of fear, that one attacks it boldly. But despair results from fear: since the reason why a man despairs is because he fears the difficulty attaching to the good he should hope for. ”

“ Although the object of daring is an evil to which, in the estimation of the daring man, the good of victory is conjoined; yet daring regards the evil, and hope regards the conjoined good. In like manner despair regards directly the good which it turns away from, while fear regards the conjoined evil. Hence, properly speaking, daring is not a part of hope, but its effect: just as despair is an effect, not a part, of fear. For this reason, too, daring cannot be a principal passion. ”

“ Now every movement of the appetitive power is reducible to one either of pursuit or of avoidance. Again, pursuit or avoidance is of something either by reason of itself or by reason of something else. By reason of itself, good is the object of pursuit, and evil, the object of avoidance: but by reason of something else, evil can be the object of pursuit, through some good attaching to it; and good can be the object of avoidance, through some evil attaching to it. ”

“ Those who have no experience of dangers are more daring, not on account of a defect, but accidentally, i.e. in so far as through being inexperienced they do not know their own failings, nor the dangers that threaten. ”

“ Fear is banished, in this way, by the removal of threatening causes of fear; for instance, by the fact that a man has not enemies, through having harmed nobody, so that he is not aware of any imminent danger; since those especially appear to be threatened by danger, who have harmed others.
On the part of the bodily transmutation, daring is caused through the incitement of hope and the banishment of fear, by those things which raise the temperature about the heart. Wherefore the Philosopher says (De Part. Animal. iii, 4) that "those whose heart is small in size, are more daring ”

“ On the part of the appetitive movement which follows apprehension, hope that leads to daring is roused by those things that make us reckon victory as possible. Such things regard either our own power, as bodily strength, experience of dangers, abundance of wealth, and the like ”

“ Trembling does occur in men of daring, on account of the heat being withdrawn from the outer to the inner parts of the body, as occurs also in those who are afraid. But in men of daring the heat withdraws to the heart ”