In the Sermon on the Mount, Jesus calls His disciples "evil" although they give good gifts to their children.
Moral evil I.e. sin, must ultimately be defined as a relationship with God Who is the standard of all goodness. When asked what the greatest commandment was, our Lord said that it was to love the Lord your God with all your heart, soul, mind and strength. This, our Lord indicated, is a summary of obedience to the law.
Likewise, sin, which is disobedience to God's moral law, is an expression of our enmity to God.
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