To handle yourself, use your head; to handle others, use your heart. Anger is only one letter short of danger. If someone betrays you once, it is his fault; if he betrays you twice, it is your fault. Great minds discuss ideas; average minds discuss events; small minds discuss people. He who loses money, loses much; he who loses a friend, loses much more; he who loses faith, loses all.
Men and women range themselves into three classes or orders of intelligence; you can tell the lowest class by their habit of always talking about persons; the next by the fact that their habit is always to converse about things; the highest by their preference for the discussion of ideas.
It followed from the special theory of relativity that mass and energy are both but different manifestations of the same thing - a somewhat unfamiliar conception for the average mind. Furthermore, the equation E = mc², in which energy is put equal to mass, multiplied by the square of the velocity of light, showed that very small amounts of mass may be converted into a very large amount of energy and vice versa.
Great minds discuss ideas. Average minds discuss events. Small minds discuss other people. Life's too short to worry about what other people do or don't do. Tend your own backyard, not theirs, because yours is the one you have to live in.