do know nothing, and
can know nothing? We live in a world which is full of misery and
ignorance, and the plain duty of each and all of us is to try to make
the little corner he can influence somewhat less miserable and somewhat
less ignorant than it was before he entered it. To do this effectually
it is necessary to be fully possessed of only two beliefs: the first,
that the order of nature is ascertainable by our faculties to an extent
which is practically unlimited; the second, that our volition counts for
something as a condition of the course of events.

Each of these beliefs can be verified experimentally, as often as we
like to try. Each, therefore, stands upon the strongest foundation upon
which any belief can rest, and forms one of our highest truths. If we
find that the ascertainment of the order of nature is facilitated by
using one terminology, or one set of symbols, rather than another, it is
our clear duty to use the former; and no harm can accrue, so long as we
bear in mind, that we are dealing merely with terms and symbols.

In itself it is of little moment whether we express the phaenomena of
matter in terms of spirit; or the phaenomena of spirit, in terms of
matter: matter may be regarded as a form of thought, thought may be
regarded as a property of matter--each statement has a certain relative
truth. But with a view to the progress of science, the materialistic
terminology is in every way to be preferred. For it connects thought
with the other phaenomena of the universe, and suggests inquiry into the
nature of those physical conditions, or concomitants of thought, which
are more or less accessible to us, and a knowledge of which may, in
future, help us to exercise the same kind of control over the world of
thought, as we already possess in respect of the material world;
whereas, the alternative, or spiritualistic, terminology is utterly
barren, and leads to nothing but obscurity and confusion of ideas.

Thus there can be little doubt, that the further science advances, the
more extensively and consistently will all the phaenomena of nature be
represented by materialistic formulae and symbols.

But the man of science, who, forgetting the limits of philosophical
inquiry, slides from these formulae and symbols into what is commonly
understood by materialism, seems to me to place himself on a level with
the mathematician, who should mistake the _x_'s and _y_'s, with which he
works his problems, for rea