I write because sometimes I want to convey a message, and other times just because I like to explore my criativity...
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Whenever you create something, be it in literature or in any field, you enjoy a very rewarding sensation.
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Your creations also give you positive thoughts (even when or if the topics are negative in nature), and you just have to keep them in mind in order to be in a good mood...
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So, you, or anybody else, should read my work, because unlike many writers who don't have anything to say, I'm one of those who believes that every book should offer something to the reader, and make him/her feel richer than before.
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While at this, these were very good questions, and just for posing them, I can feel that you are also a writer who takes his work seriously, and that your books also have a 'soul'...