attention, we find only that the one body approaches the other; and that
the motion of it precedes that of the other, but without any, sensible
interval. It is in vain to rack ourselves with farther thought and
reflection upon this subject. We can go no farther in considering this
particular instance.

Should any one leave this instance, and pretend to define a cause, by
saying it is something productive of another, it is evident he would say
nothing. For what does he mean by production? Can he give any definition
of it, that will not be the same with that of causation? If he can; I
desire it may be produced. If he cannot; he here runs in a circle, and
gives a synonimous term instead of a definition.

Shall we then rest contented with these two relations of contiguity and
succession, as affording a complete idea of causation? By, no means. An
object may be contiguous and prior to another, without being considered
as its cause. There is a NECESSARY CONNEXION to be taken into
consideration; and that relation is of much greater importance, than any
of the other two above-mentioned.

Here again I turn the object on all sides, in order to discover the
nature of this necessary connexion, and find the impression, or
impressions, from which its idea may be derived. When I cast my eye on
the known Qualities of objects, I immediately discover that the relation
of cause and effect depends not in the least on them. When I consider
their relations, I can find none but those of contiguity and succession;
which I have already regarded as imperfect and unsatisfactory. Shall the
despair of success make me assert, that I am here possest of an idea,
which is not preceded by any similar impression? This would be too strong
a proof of levity and inconstancy; since the contrary principle has been