We learn how to be mad, the same way we learn how to be male or
female, or how we learn how to participate in society. We look to
others we respect and imitate their behaviors. We follow the
instructions of teachers and parents, and we are subtly punished or
rewarded for various quirks until we learn to mold ourselves in a
certain way to avoid responses we don't like and attain the responses
we do.

http://www.thesmartset.com/article/article10281101.aspx

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