David Hume

“ In like manner our temper, when elevated with joy, naturally throws itself into love, generosity, pity, courage, pride, and the other resembling affections. 'Tis difficult for the mind, when actuated by any passion, to confine itself to that passion alone, without any change or variation. Human nature is too inconstant to admit of any such regularity. ”

“ Those principles, which forward the transition of ideas, here concur with those, which operate on the passions; and both uniting in one action, bestow on the mind a double impulse. The new passion, therefore, must arise with so much greater violence, and the transition to it must be render'd so much more easy and natural. ”

“ In the third place, 'tis observable of these two kinds of association, that they very much assist and forward each other, and that the transition is more easily made where they both concur in the same object. Thus a man, who, by any injury from another, is very much discompos'd and ruffled in his temper, is apt to find a hundred subjects of discontent, impatience, fear, and other uneasy passions; especially if he can discover these subjects in or near the person, who was the cause of his first passion. ”

“ Thus we have establish'd two truths without any obstacle or difficulty, that ’tis from natural principles this variety of causes excite pride and humility, and that ’tis not by a different principle each different cause is adapted to its passion. ”

“ The rule, by which they proceed, is to pass from one object to what is resembling, contiguous to, or produc'd by it. When one idea is present to the imagination, any other, united by these relations, naturally follows it, and enters with more facility by means of that introduction. ”

“ In order to this we must reflect on certain properties of human nature, which tho' they have a mighty influence on every operation both of the understanding and passions, are not commonly much insisted on by philosophers. The first of these is the association of ideas, which I have so often observ'd and explain'd. 'Tis impossible for the mind to fix itself steadily upon one idea for any considerable time ”

“ Upon this occasion I may cite the authority of an elegant writer, who expresses himself in the following manner. 'As the fancy delights in every thing that is great, strange, or beautiful, and is still more pleas'd the more it finds of these perfections in the same object, so it is capable of receiving a new satisfaction by the assistance of another sense. ”