rd and evil deed will tend to come back and make us
bad again. Every good work and word will leave its memory and make us
better. We ought to fill our minds with good memories.

=145. Thinking.=--The brain also thinks. Thinking is different from
feeling and from moving, but we can think about our feelings and about
our movements. The brain just back of the forehead does all our
thinking. A dog has only a little forehead, and cannot think much. But
the rest of its brain is large, for it can see and hear and run as
well as a man. A baby can see and hear and move, but it cannot think
until it is taught how. Boys and girls go to school to learn to think.
Thinking is work, just as truly as running is work. At school, no one
can learn to think without working. Looking at things and hearing some
one talk about them will not make you a strong-minded man, but
thinking about these things will. Boys and girls should study and
think, as well as look around and listen.

=146. How thought rules the body.=--We are always feeling and moving.
We often do these things without trying, but we must make ourselves
think. We can make our bodies move, or keep still, and we can keep
from too much feeling. Our thoughts direct our natural desires to move
and feel. In an animal, the feelings and movements direct the
thoughts. When men let their feelings rule their thoughts, they are
like animals. When the thoughts control the feelings and acts, we are
men. If you get angry and cry, when you hurt your finger, then you are
like an animal; but if you think about it and control your feelings,
you are behaving like a strong and noble man. The thought part of the
brain ought to rule all the rest.

=147. Sleep.=--Most of the brain does its work without our knowing it,
but we know when we think. The thinking part of the brain gets tired,
like any other part of the body. When it stops work, we are asleep.

We must give the brain a rest in sleep, just as we must rest an arm or
a leg. We ought to give it regular rest. Every night we ought to go to
bed early. Then we shall be ready to get up early and shall feel like
working. Boys and girls need nine or ten hours' sleep each day. When
they are grown, they need seven or eight hours' sleep each day.

The spinal cord and some parts of the brain must always stay awake to
make the cells of the body eat and grow. When we are asleep, they must
be wide awake, and must repair the worn-out parts. They do not seem t