You must learn to be satisfied with that, but people have the nature of greed. So sometimes is cheated, also an opportunity to cheat, because often treats cheap, later he found himself cheated. One's life time is fixed, can in time to enjoy is the wish of many people, but the reality is cruel, no against people. As a result, many people are useless to through life, until old age or regret.
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From @whitegourd