"Quick
as thought," as we say, you draw them away again. But before you did so,
what had happened?
The nerves at the tip of your finger had sent a telegram straight home to
the brain, "Too hot!" or "Too cold!" and the brain had telegraphed back to
the fingers, "Keep out of the way of it!" whatever the hot or cold thing
may have been.
To think, even for a moment, of these lightning messages running backwards
and forwards, to and from the brain, gives us some little idea how very
wonderful the brain itself must be, and also how God has made one part of
the body to depend upon another.
Apart from the brain, the ear would be conscious of no sound, whether the
soft wash of the waves along the shore, or the mighty roll of the thunder
through the sky. On the other hand, none of these voices could reach the
brain if God had not "planted the ear," and formed it so perfectly to
receive the waves of sound which, striking upon its delicate little "drum,"
cause it to vibrate, and so are passed on by the nerve which takes messages
to the brain. For it is the brain which takes charge of every "impression"
conveyed to it by eye, ear, hand, nose, or palate; but _how_ these
impressions conveyed to the brain give rise to what we call "thoughts" and
"ideas"--this is one of the secret things which belong to God, and of which
He has not allowed the wisest man to say, "Oh yes, I understand all about
it!"
And there is another secret thing which cannot be explained.
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