presumption against it,
were it so very easy and obvious.

It is evident, that all the sciences have a relation, greater or less,
to human nature: and that however wide any of them may seem to run from
it, they still return back by one passage or another. Even. Mathematics,
Natural Philosophy, and Natural Religion, are in some measure dependent
on the science of MAN; since the lie under the cognizance of men, and
are judged of by their powers and faculties. It is impossible to tell
what changes and improvements we might make in these sciences were we
thoroughly acquainted with the extent and force of human understanding,
and could explain the nature of the ideas we employ, and of the
operations we perform in our reasonings. And these improvements are
the more to be hoped for in natural religion, as it is not content with
instructing us in the nature of superior powers, but carries its views
farther, to their disposition towards us, and our duties towards them;
and consequently we ourselves are not only the beings, that reason, but
also one of the objects, concerning which we reason.

If therefore the sciences of Mathematics, Natural Philosophy, and
Natural Religion, have such a dependence on the knowledge of man, what
may be expected in the other sciences, whose connexion with human nature
is more close and intimate? The sole end of logic is to explain the
principles and operations of our reasoning faculty, and the nature of
our ideas: morals and criticism regard our tastes and sentiments: and
politics consider men as united in society, and dependent on each other.
In these four sciences of Logic, Morals, Criticism, and Politics, is
comprehended almost everything, which it can any way import us to be
acquainted with, or which can tend either to the improvement or ornament
of the human mind.

Here then is the only expedient, from which we can hope for success in
our philosophical researches, to leave the tedious lingering method,
which we have hitherto followed, and instead of taking now and then a
castle or village on the frontier, to march up directly to the capital
or center of these sciences, to human nature itself; which being once
masters of, we may every where else hope for an easy victory. From this
station we may extend our conquests over all those sciences, which more
intimately concern human life, and may afterwards proceed at leisure
to discover more fully those, which are the objects of pore curiosity.
Th