Pleasure and displeasure (or pain)
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Explanation and definition
As in sense that which is really within us is, as I have said before, only motion, caused by the action of external objects but in appearance; to the sight, light and colour; to the ear, sound; to the nostril, odour, etc.: so, when the action of the same object is continued from the eyes, ears, and other organs to the heart, the real effect there is nothing but motion, or endeavour; which consisteth in appetite or aversion to or from the object moving. But the appearance or sense of that motion is that we either call delight or trouble of mind.
This motion, which is called appetite, and for the appearance of it delight and pleasure, seemeth to be a corroboration of vital motion, and a help thereunto; and therefore such things as caused delight were not improperly called jucunda (a juvando), from helping or fortifying; and the contrary, molesta, offensive, from hindering and troubling the motion vital.
Pleasure therefore, or delight, is the appearance or sense of good; and molestation or displeasure, the appearance or sense of evil. And consequently all appetite, desire, and love is accompanied with some delight more or less; and all hatred and aversion with more or less displeasure and offence.
Hobbes, Lev VI 9-11
Pleasures of sense vs. pleasure in expectation of consequences
Of pleasures, or delights, some arise from the sense of an object present; and those may be called pleasures of sense (the word sensual, as it is used by those only that condemn them, having no place till there be laws). Of this kind are all onerations and exonerations of the body; as also all that is pleasant, in the sight, hearing, smell, taste, or touch. Others arise from the expectation that proceeds from foresight of the end or consequence of things, whether those things in the sense please or displease: and these are pleasures of the mind of him that draweth in those consequences, and are generally called joy. In the like manner, displeasures are some in the sense, and called pain; others, in the expectation of consequences, and are called grief.
Hobbes, Lev VI 12