Now, of appetites, some are irrational, others attended by reason. I call all those irrational which men desire, not from any conception which they form: of this kind are all which are said to exist naturally, as those of the body; thirst or hunger, for instance, in the case of sustenance; and the appetite of sustenance in every kind. And the appetites connected with objects of taste, and of lust, and, in fact, objects of touch generally; the appetite of fragrant odors, too, as connected with smelling, and hearing, and sight. Appetites attended by reason are all those whatsoever which men exercise from a persuasion: for many things there are which they desire to behold, and possess, on hearsay and persuasion. Now, as the being pleased stands in the perception of a certain affection, and as imagination is a kind of faint perception, there will attend on him who exercises either memory or hope a kind of imagination of that which is the object of his memory or hope; but if so, it is plain that they who exercise memory or hope, certainly feel pleasure, since they have also a perception. So that everything pleasant consists either in the perception of present objects, or in the remembrance of those which have already been, or in the hope of such as are yet to be; for men exercise perception on present, memory on past, and hope on future objects. Now the objects of memory are pleasant, not only such as at the moment while present were pleasant, but some even which were not pleasant, should their consequence subsequently be honorable and good; and hence this saying, "But it is indeed pleasant for a man, when preserved, to remember his toils"; and this, "For after his sufferings, a man who has suffered much, and much achieved, is gladdened at the recollection." But the reason of this is, that to be exempt from evil is pleasant. And all objects are pleasant in hope, which appear by their presence either to delight or benefit in a great degree; or to benefit, without giving pain. In a word, whatever objects by their presence delight us, do so, generally speaking, as we hope for, or remember them. On which account, too, the feeling of anger is pleasant; just as Homer has remarked of anger in his poem, "That which with sweetness far greater than distilling honey as it drops"; for there is no one who feels anger where the object seems impracticable to his revenge; nor with those far their superiors in power do men feel anger at all, or if they do, it is in a less degree.