People have a moral standard about what they will do and will not do. At the end of the day someone who cheats has a lower moral standard than someone who does not. And they will cheat in other areas of life as well.
It's surprising how many persons go through life without ever recognizing that their feelings toward other people are largely determined by their feelings toward themselves and if you're not comfortable within yourself you can't be comfortable with others.
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A man who has been the indisputable favorite of his mother keeps for life the feeling of a conqueror.