This section is from the "Nature Cure: Philosophy and Practice Based on the Unity of Disease and Cure" book, by Henry Lindlahr.
The lungs are to the body what the bellows are to the fires of the forge. The more regularly and vigorously the air is forced through the bellows and through the lungs, the livelier burns the flame in the smithy and the fires of life in the body.
Practice deep, regular breathing systematically for one week, and you will be surprised at the results. You will feel like a different person, and your working capacity, both physically and mentally, will be immensely increased.
A plentiful supply of fresh air is more necessary than food and drink. We can live without food for weeks, without water for days, but without air only a few minutes.