.
That changed their nature. Remember, they weren’t created infallible. They were the only ones who were posse peccare, posse non peccare.
This is the point - they didn’t have a sin nature, but sinned nonetheless. If they could act against their nature & sin, why couldn’t we who have a sin nature also act contrary to that nature & behave (albeit not regularly) righteously?
Romans 2:14-15 (NASB) 14 For when Gentiles who do not have the Law do instinctively the things of the Law, these, not having the Law, are a law to themselves, 15 in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them,
Genesis 3:22 (NASB) Then the LORD God said, "Behold, the man has become like one of Us, knowing good and evil; and now, he might stretch out his hand, and take also from the tree of life, and eat, and live forever"--
If the unsaved have God’s good law on their hearts, and have a knowledge of good, they can’t be totally depraved of good.