BOOK I PART II
ble bodies; and upon shutting them again, and
considering the distance betwixt these bodies,
I acquire the idea of extension. As every idea
is derived from some impression, which is ex-
actly similar to it, the impressions similar to
this idea of extension, must either be some sen-
sations derived from the sight, or some internal
impressions arising from these sensations.
Our internal impressions are our passions,
emotions, desires and aversions; none of
which, I believe, will ever be asserted to be the
model, from which the idea of space is derived.
There remains therefore nothing but the senses,
which can convey to us this original impres-
sion. Now what impression do oar senses here
convey to us? This is the principal question,
and decides without appeal concerning the na-
ture of the idea.