When a child learns to swear, or to use slang phrases, the brain after a while will make him swear or use bad words before he thinks.

In a similar manner other bad habits are acquired.
SUMMARY.
1.

A person without a brain or nerves would be of no more account than a vegetable.
2.

When the brain or nerves are sick they cannot perform their duties properly.
3.

To keep the brain and nerves in good health, we must take good care of the stomach and all other important organs of the body.
4.