171 both have influence upon each other

Physical body and brain body have influence upon each other.
When the physical body is ill, one cannot undertake mind work properly.
When a mother hears the news that her son who went on a bike met with an accident, she will fall unconscious. The information only goes to the brain but the physical body becomes completely affected too.
If you keep your mind free of worries, your physical body will be well
If you keep your physical body healthy, your brain body will work better
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