Many of us feel busy without really being busy at all.

But how many of us realize that while we are doing work outside, our bodies themselves have good, steady work to do inside.
Our lungs have to take oxygen from the air and give it to our blood; our blood has to carry it all through our bodies and take away the waste by means of the steady pumping of our hearts.

Our stomachs must digest the food put into them, give the nourishment in it to the blood, and see that the waste is cast off.
All this work is wholesome and good, and goes on steadily, giving us health and strength and new power; but if we, through mismanagement, make heart or lungs or stomach work harder than they should, then they must rob us of power to accomplish what we give them to do, and we blame them, instead of blaming ourselves for being hard and unjust taskmasters.
The strain in a stomach necessary to the digesting of too much food, or the wrong kind of food, makes itself felt in strain all through the whole system.
I knew a woman whose conscience was troubling her very greatly.

She was sure she had done many very selfish things for which there was no excuse, and that she herself was greatly to blame for other people's troubles.

This was a very acute attack of conscience, accompanied by a very severe stomach ache.