Thomas Aquinas

“ Whereas from the fact that we love someone we do not hope in him, except accidentally, that is, in so far as we think that he returns our love. Wherefore the fact of being loved by another makes us hope in him; but our love for him is caused by the hope we have in him. ”

“ Moreover, possibility and impossibility are not altogether accidental to the object of the appetitive power: because the appetite is a principle of movement; and nothing is moved to anything except under the aspect of being possible; for no one is moved to that which he reckons impossible to get. Consequently hope differs from despair according to the difference of possible and impossible. ”

“ If it be said that hope, in addition to desire, denotes the possibility of obtaining the future good; on the contrary, whatever is accidental to the object does not make a different species of passion. But possibility of acquisition is accidental to a future good, which is the object of cupidity or desire, and of hope. Therefore hope does not differ specifically from desire or cupidity.
On the contrary, To different powers belong different species of passions. But hope is in the irascible power; whereas desire or cupidity is in the concupiscible. ”

“ I answer that, Hope of its very nature is a help to action by making it more intense: and this for two reasons. First, by reason of its object, which is a good, difficult but possible. For the thought of its being difficult arouses our attention; while the thought that it is possible is no drag on our effort. Hence it follows that by reason of hope man is intent on his action. ”

“ Despair threatens danger in war, on account of a certain hope that attaches to it. For they who despair of flight, strive less to fly, but hope to avenge their death: and therefore in this hope they fight the more bravely, and consequently prove dangerous to the foe. ”

“ And accordingly hope is a movement of the appetitive power ensuing from the apprehension of a future good, difficult but possible to obtain; namely, a stretching forth of the appetite to such a good.
Reply to Objection 1: Since hope regards a possible good, there arises in man a twofold movement of hope; for a thing may be possible to him in two ways, viz. by his own power, or by another's. Accordingly when a man hopes to obtain something by his own power, he is not said to wait for it, but simply to hope for it. ”

“ Therefore there is no hope in dumb animals, since they have no mind.
Objection 3: Further, Augustine says (Gen. ad lit. ix, 14) that "animals are moved by the things that they see." But hope is of things unseen: "for what a man seeth, why doth he hope for?" (Rom. 8:24) . Therefore there is no hope in dumb animals.
On the contrary, Hope is an irascible passion. But the irascible faculty is in dumb animals. Therefore hope is also. ”

“ I answer that, Since hope denotes a certain stretching out of the appetite towards good, it evidently belongs to the appetitive power; since movement towards things belongs properly to the appetite: whereas the action of the cognitive power is accomplished not by the movement of the knower towards things, but rather according as the things known are in the knower. But since the cognitive power moves the appetite, by presenting its object to it; there arise in the appetite various movements according to various aspects of the apprehended object. ”

“ I answer that, The internal passions of animals can be gathered from their outward movements: from which it is clear that hope is in dumb animals. For if a dog see a hare, or a hawk see a bird, too far off, it makes no movement towards it, as having no hope to catch it: whereas, if it be near, it makes a movement towards it, as being in hopes of catching it. ”

“ Although dumb animals do not know the future, yet an animal is moved by its natural instinct to something future, as though it foresaw the future. Because this instinct is planted in them by the Divine Intellect that foresees the future. ”

“ Fear is contrary to hope, because their objects, i.e. good and evil, are contrary: for this contrariety is found in the irascible passions, according as they ensue from the passions of the concupiscible. But despair is contrary to hope, only by contrariety of approach and withdrawal. ”

“ For the apprehension of good gives rise to one kind of movement in the appetite, while the apprehension of evil gives rise to another: in like manner various movements arise from the apprehension of something present and of something future ”

“ In like manner, in reply to the Second Objection, we must observe that young people and men in drink are indeed unsteady in reality: but, in their own estimation, they are capable, for they know not their shortcomings. ”