BOOK II PART I
remarkable difference, that ideas are associated
by resemblance, contiguity, and causation; and
impressions only by resemblance.
In thethirdplace, it is observable of these two
kinds of association, that they very much as-
sist and forward each other, and that the transi-
tion is more easily made where they both con-
cur in the same object. Thus a man, who, by
any injury from another, is very much discom-
posed 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.
Those principles, which forward the transition
of ideas, here concur with those, which oper-
ate on the passions; and both uniting in one
action, bestow on the mind a double impulse.