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Desire.       §6. The uneasiness a Man finds in himself upon the absence of
any thing, whose present enjoyment carries the Idea of Delight with
it, is that we call Desire, which is greater or less, as that uneasiness is
more or less vehement. Where by the bye it may perhaps be of some
use to remark, that the chief if not only spur to humane Industry
and Action is uneasiness. For whatever good is propos’d, if its
absence carries no displeasure nor pain with it; if a Man be easie and
content without it, there is no desire of it, nor endeavour after it;
there is no more but a bare Velleity, the term used to signifie the
lowest degree of Desire, and that which is next to none at all, when
there is so little uneasiness in the absence of any thing, that it
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carries a Man no farther than some faint wishes for it, without any
more effectual or vigorous use of the means to attain it. Desire also is
stopp’d or abated by the Opinion of the impossibility or unattain-
ableness of the good propos’d, as far as the uneasiness is cured or
allay’d by that consideration. This might carry our thoughts farther
were it seasonable in this place.
Locke Hum II, 20, §6, pp. 230-231