(10) Fear, on the other
hand, is an inconstant pain also arising from the image of something
concerning which we are in doubt. (11) If the element of doubt be removed
from these emotions, hope becomes Confidence and fear becomes Despair.
(18:12) In other words, Pleasure or Pain arising from the image of something
concerning which we have hoped or feared. (13) Again, Joy is Pleasure
arising from the image of something past whereof we doubted the issue.
(14) Disappointment is the Pain opposed to Joy.
Prop. [XIX] He who conceives that the object of his love is
destroyed will feel pain; if he conceives that
it is preserved he will feel pleasure.
Proof.- (19:1) The mind, as far as possible, endeavours to conceive
those things which increase or help the body's power of activity
([xii] ); in other words ([xii] note), those things which it
loves. (2) But conception is helped by those things which postulate
the existence of a thing, and contrariwise is hindered by those which
exclude the existence of a thing (II:[xvii] ); therefore the images of
things, which postulate the existence of an object of love, help the
mind's endeavour to conceive the object of love, in other words
([xi] note), affect the mind pleasurably; contrariwise those things,
which exclude the existence of an object of love, hinder the aforesaid
mental endeavour; in other words, affect the mind painfully.
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