So if he would have simply abstained he would have met the same fate?
I'm having a problem seeing the difference in contraception and planned abstinence.
If you have the urge to have sex but don't want a child you can use protection or abstain. Both have the same result, no child.
I don't know if he would have the same fate. I said disobedience would result in punishment -- and wouldn't you agree with that? Keep in mind that NFP isn't a means to abstain totally in order to avoid pregnancy. In fact, it's quite different from the "rhythm method" because even that discards the notion of giving entirely to the vocation of marriage.
Onan's sin was disobedience to God via lust and selfishness. When something like NFP is practices, it is a means of devoting entirely to the sanctity of marriage, accepting the spouse entirely as she is, not separating her from her from the procreative. Contraception, however, is intended to directly do those things.
But let's say, just for argument's sake, that I am indeed wrong when practicing NFP with my wife. If I am wrong for it, does my behavior dictate what is right and wrong? Wouldn't contraception still be 100% evil in its nature regardless?
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