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basically there would have to be a nature higher than god for him to sin - since this defies the understanding of the word 'god' (no nature higher than him), the only other possibility is if god could transgress his own nature, which requires the influence of illusion or ignorance, and this also defies the standard definition of the word 'god' (no trace of the illusory influence of ignorance)
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This statement is not needed. Basically it would be of better use to say that a god can do anything, but wont regard what it does as a 'sin' or evil the way humans perceive the word.