Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

All sin is prompted by the dictates of nature. These dictates of nature, which are among the hallmarks of corporeal existence, are not sins with respect to the animal but are sins with regard to man. The animal is the source of imperfections such as anger, lust, envy, greed, cruelty, and pride. All these blameworthy qualities are found in the nature of the animal, and do not constitute sins with regard to the animal, whereas they are sins with regard to man (29:6)

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