One can quiet and soothe oneself inside quite wonderfully with the study of long gentle breaths.

But it must be a study.

We must study to begin inhaling gently, to change to the exhalation with equal delicacy, and to keep the same gentle, delicate pressure throughout, each time trying to make the breath a little longer.
After we have had many days of the gentle, long breaths at intervals for half an hour, then we can breathe rhythmically (inhale counting five or ten, exhale counting five or ten), steadily for half an hour, trying all the time to have the breath more quiet, gentle and steady, drawing it in and letting it out with always decreasing effort.

It is wonderful when we discover how little effort we really need to take a full and vigorous breath.

This half hour's breathing exercise every day will help us to the habit of breathing rhythmically all the time, and a steady rhythmic breath is a great physical help toward a quiet mind.
We can mingle with the deep breathing simple exercises of lifting each arm slowly and heavily from the shoulder, and then letting it drop a dead weight, and pausing while we feel conscious of our arms resting without tension in the lap or on the couch.
But all this has been with relation to the body, and it is the mental and moral dust of which I am writing.