It seems to be axiomatic that going around harboring feelings of anger is hazardous to your well-being. See for example this extensive list of quotable quotations about the perils of anger and how to handle it.

Americans seem to be angrier and more pessimistic than they used to be. But according to a new NBC online poll poorer, non-Hispanic white people are the angriest. They are also the most pessimistic about the prospects...
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