I know that our bodies were made to thrive only in pure air, and the scenes in which pure air is found.

Of the three things that are indispensable for the subsistence of man, — namely, air, water, and food — the first is the most important. We should all be as much against the breathing of impure air as we are against the drinking of dirty water and the eating of dirty food; but the air we breathe is, as a rule, far more impure than the water we drink or the food we eat. ... In fact, every child should be taught the value of fresh air, as soon as it is able to understand anything. ... All men should learn to breathe through the nose alone. And this is not at all difficult, if we remember to keep our mouth firmly shut at all times, except when we are talking. After learning how to inhale the air, we should cultivate the habit of breathing fresh air, day in and day out. (Chapter III, Air)

That the vegetable creation should restore the air which is spoiled by the animal part of it, looks like a rational system, and seems to be of a piece with the rest. Thus fire purifies water all the world over. It purifies it by distillation, when it raises it in vapours, and lets it fall in rain; and farther still by filtration, when keeping it fluid, it suffers that rain to percolate the earth. We knew before that putrid animal substances were converted into sweet vegetables when mixed with the earth and applied as manure; and now, it seems, that the same putrid substances, mixed with the air, have a similar effect. The strong, thriving state of your mint, in putrid air, seems to show that the air is mended by taking something from it, and not by adding to it. I hope this will give some check to the rage of destroying trees that grow near houses, which has accompanied our late improvements in gardening, from an opinion of their being unwholesome. I am certain, from long observation, that there is nothing unhealthy in the air of woods; for we Americans have everywhere our country habitations in the midst of woods, and no people on earth enjoy better health or are more prolific.

The chief agency for keeping the blood pure is the air. When the blood returns to the lungs after one complete round over the body, it is impure and contains poisonous elements. The oxygen of the air which we inhale purifies this blood and is assimilated into it, while the nitrogen absorbs the poisonous matter and is breathed out. ... The air which we inhale is taken into the lungs through the windpipe, and the blood is purified by it. It is of the utmost importance to breathe through the nose, instead of through the mouth. (Chapter II, The Human Body)

Impure means result in an impure end... One cannot reach truth by untruthfulness. Truthful conduct alone can reach Truth.

Clean air is vitally important. Clean water, crystal clean water is vitally important. Safety is vitally important.

For every person who perishes from the effects of a stimulant, at least a thousand die from the consequences of drinking impure water. This precious fluid, which daily infuses new life into us, is likewise the chief vehicle through which disease and death enter our bodies. The germs of destruction it conveys are enemies all the more terrible as they perform their fatal work unperceived. They seal our doom while we live and enjoy. The majority of people are so ignorant or careless in drinking water, and the consequences of this are so disastrous, that a philanthropist can scarcely use his efforts better than by endeavoring to enlighten those who are thus injuring themselves. By systematic purification and sterilization of the drinking water the human mass would be very considerably increased. It should be made a rigid rule which might be enforced by law to boil or to sterilize otherwise the drinking water in every household and public place. The mere filtering does not afford sufficient security against infection. All ice for internal uses should be artificially prepared from water thoroughly sterilized. The importance of eliminating germs of disease from the city water is generally recognized, but little is being done to improve the existing conditions, as no satisfactory method of sterilizing great quantities of water has yet been brought forward. By improved electrical appliances we are now enabled to produce ozone cheaply and in large amounts, and this ideal disinfectant seems to offer a happy solution of the important question.

Our city of the future will be without smoke, dust or gases from manufacturing plants, and the air will therefore be pure. The streets will be as clean as our drawing rooms today. Smoke will be thoroughly consumed, and gases liberated in manufacture will be tanked and burned. Railways will be operated electrically, all building operations will be effectually shut in to prevent the escape of dust, and horses will disappear from the streets. Out of all these things will come not only commercial economy but bodily health and spiritual joy. As the water is generally pure, all that is needed is more economy in its use. Congestion is intolerable in all the great cities in the world and relief is imperative. It will be found in diverting people in other directions and in changing construction so as to carry more traffic . We may expect, in any event, double tunnels under all the business streets and the utmost use of the present street levels by extensive double-decking and many more overhead transportation lines. Some time the rush in the cities may cease, but I see no signs now of its ceasing, and meanwhile crowding must be dealt with. We need systems of passes around the congested districts. We need still more and mainly to diminish the number of people and vehicles using given areas.

What keeps earth air breathable? Not oxygen alone. The earth is a freer place to breathe in, every time you love without calculating a return – every time you make your drudgeries and routines still more inefficient by stopping to experience the shock of beauty wherever it unpredictably flickers.

The air I breathe in a room empty of you is unhealthy.

The air of one’s native country is the most healthy air.

Moreover, all are unanimous in declaring the first method the safer of the two. A pure life, the performance of good deeds, righteousness, compassion, detachment from worldly cares, selflessness and quietness of mind act – they say – as a cleansing process which gradually removes the impure dust that covers the mental eyes,

Our minds fall very readily under the spell of such unmitigated words as Purity and Chastity. Only death beyond decay, absolute non-existence, can be Pure and Chaste. Life is impurity, fact is impure. Everything has traces of alien matter; our very health is dependent on parasitic bacteria; the purest blood in the world has a tainted ancestor, and not a saint but has evil thoughts.... This stupidity, this unreasonable idealism of the common mind, fills life to-day with cruelties and exclusions, with partial suicides and secret shames. But we are born impure, we die impure; it is a fable that spotless white lilies sprang from any saint's decay, and the chastity of a monk or nun is but introverted impurity. We have to take life valiantly on these conditions and make such honour and beauty and sympathy out of our confusions, gather such constructive experience, as we may.... Life is that, and abstinence is for the most part a mere evasion of life.

Solitude matters, and for some people it is the air that they breathe.