ithout attending to the
particular qualities of the angles, or relations of the sides. So far he
may abstract; but this will never prove that he can frame an abstract,
general, inconsistent idea of a triangle. In like manner we may consider
Peter so far forth as man, or so far forth as animal without framing the
fore-mentioned abstract idea, either of man or of animal, inasmuch as all
that is perceived is not considered.

17. ADVANTAGE OF INVESTIGATING THE DOCTRINE OF ABSTRACT GENERAL
IDEAS.--It were an endless as well as an useless thing to trace the
SCHOOLMEN, those great masters of abstraction, through all the manifold
inextricable labyrinths of error and dispute which their doctrine of
abstract natures and notions seems to have led them into. What bickerings
and controversies, and what a learned dust have been raised about those
matters, and what mighty advantage has been from thence derived to
mankind, are things at this day too clearly known to need being insisted
on. And it had been well if the ill effects of that doctrine were
confined to those only who make the most avowed profession of it. When
men consider the great pains, industry, and parts that have for so many
ages been laid out on the cultivation and advancement of the sciences,
and that notwithstanding all this the far greater part of them remains
full of darkness and uncertainty, and disputes that are like never to
have an end, and even those that are thought to be supported by the most
clear and cogent demonstrations contain in them paradoxes which are
perfectly irreconcilable to the understandings of men, and that, taking
all together, a very small portion of them does supply any real benefit
to mankind, otherwise than by being an innocent diversion and
amusement--I say the consideration of all this is apt to throw them into
a despondency and perfect contempt of all study. But this may perhaps
cease upon a view of the false principles that have obtained in the
world, amongst all which there is none, methinks, has a more wide and
extended sway over the thoughts of speculative men than [Note.] this of
abstract general ideas.

[Note: "That we have been endeavouring to overthrow."--Edit 1710.]

18. I come now to consider the SOURCE OF THIS PREVAILING NOTION, and that
seems to me to be LANGUAGE. And surely nothing of less extent than reason
itself could have been the source of an opinion so universally received.
The truth of this appears as from other r