I try not to make a habit of fostering grudges. Its not a healthy way to live, even if it is admittedly really fun to revel in your hatred for someone or something. Of course, theres a difference between reveling and motivating. Hatred, vengeance, spite; these all make pretty excellent motivators. Heck, Ive heard more than a few people say the key to success in life is to hate life so much, you succeed just to get back at it.
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