that man's body and mind are part of a causal and orderly world.

Let us consider, for example, the movement of a muscle. Every such
movement must be caused. The physiologist has discovered what this cause
is. Ordinarily and normally, a muscle contracts only when stimulated by
a nerve current. Tiny nerve fibrils penetrate every muscle, ending in
the muscle fibers. The nerve-impulse passing into the fibers of the
muscles causes them to contract. The nerve stimulus itself has a cause;
it ordinarily arises directly or indirectly from the stimulation of a
sense organ. And the sense organs are stimulated by outside influences,
as was explained previously.

Not only are our movements caused, but our sensations, our ideas, and
our feelings follow upon or are dependent upon some definite bodily
state or condition. The moment that we recognize this we see that our
sensations, ideas, and feelings are subject to control. It is only
because our minds are in a world of causality, and subject to its laws,
that education is possible. We can bring causes to bear upon a child and
change the child. It is possible to build up ideas, ideals, and habits.
And ideas, ideals, and habits constitute the man. Training is possible
only because a child is a being that can be influenced. What any child
will be when grown depends upon what kind of child it was at the
beginning and upon the influences that affect it during its early life
while it is growing into maturity. We need have no doubt about the
outcome of any particular child if we know, with some degree of
completeness, the two sets of factors that determine his life--his
inheritance and the forces that affect this inheritance. We can predict
the future of a child to the extent that we know and understand the
forces that will be effective in his life.