Religious icon: David and Jonathan (from Old Testament).
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Setting aside for a moment specific proscriptive definitions of sin, which vary from source to source, let us examine the fundamental principle. As one would not claim credit for innate advantages and virtues in oneself — and surely any sincerely religious person would humbly attribute them to God — so one cannot apportion blame for innate defects or social unorthodoxies in others. How, then, can a just and merciful God — and surely no decent person would revere any other kind — fix his canon against that which some among his people do in accordance with an inherent nature that they have not chosen?
The ultimate precept, then: Absent free will, there can be no sin.