By this time the dust is laid in the nursery, and by changing the games a little, or telling them a story first, the mother is able to leave a nursery full of quiet, happy children.
Now if we, who would like to live happily and keep well, according to plain common sense, can put ourselves with intelligent humility in the place of these little children and study to be quiet, we will be working for that background which is never failing in its possibilities of increasing light and warmth and the expanse of outlook.
First with regard to a quiet body.

Indigestion makes us unquiet, therefore we must eat only wholesome food, and not too much of it, and we must eat it quietly.

Poor breathing and poor blood makes us unquiet, therefore we should learn to expand our lungs to their full extent in the fresh air and give the blood plenty of oxygen.

Breathing also has a direct effect on the circulation and the brain, and when we breathe quietly and rhythmically, we are quieting the movement of our blood as well as opening the channels so that it can flow without interruption.
We are also quieting our brain and so our whole nervous system.
Lack of exercise makes us unquiet, because exercise supplies the blood more fully with oxygen and prevents it from flowing sluggishly, a sluggish circulation straining the nervous system.

It is therefore important to take regular exercise.
Want of rest especially makes us unquiet; therefore we should attend to it that we get--as far as possible--what rest we need, and take all the rest we get in the best way.