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" In 1966, American anthropologist Edward T. Hall specified four distinct distance zones to describe the perception of physical space around us. Understanding these zones and honoring their invisible boundaries will give you a sixth sense about another person’s “space” as well as your own.
Intimate Zone (less than 2’) —This zone represents our personal space and is reserved for the most trusted and loved people in our lives. Touching, hugging, standing side by side, and engaging in private conversations is common and encouraged. When an interloper violates this personal space, great discomfort and awkwardness can be created. What to do? Take a step back or sideways.
Personal Zone (2’-4’) —This is the distance for interaction with good friends, family, social gatherings, or parties. It's an easy and relaxed space for talking, shaking hands, gesturing, laughing and making faces.
Social Zone (4’-12') —This zone seems to be an appropriate distance for casual friends, colleagues, and acquaintances to interact. It is the comfortable distance we maintain while interacting or addressing large groups of people.
Public Zone (over 12’) —This is the distance we keep from strangers or persons with little acquaintance. It provides the greatest distance between people. This is a safe space that still allows us to experience community and belonging with new people. "
― Susan C. Young , The Art of Body Language: 8 Ways to Optimize Non-Verbal Communication for Positive Impact (The Art of First Impressions for Positive Impact, #3)
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" [A man], who is in prosperity, while he sees that others have to contend with great wretchedness and that he could help them, thinks: What concern is it of mine? Let everyone be as happy as Heaven pleases, or as he can make himself; I will take nothing from him nor even envy him, only I do not wish to contribute anything to his welfare or to his assistance in distress! Now no doubt, if such a mode of thinking were a universal law, the human race might very well subsist, and doubtless even better than in a state in which everyone talks of sympathy and good-will, or even takes care occasionally to put it into practice, but, on the other side, also cheats when he can, betrays the rights of men, or otherwise violates them. But although it is possible that a universal law of nature might exist in accordance with that maxim, it is impossible to will that such a principle should have the universal validity of a law of nature. For a will which resolved this would contradict itself, inasmuch as many cases might occur in which one would have need of the love and sympathy of others, and in which, by such a law of nature, sprung from his own will, he would deprive himself of all hope of the aid he desires. "
― Immanuel Kant , Groundwork of the Metaphysics of Morals