God wants us to worry about our sins we sin; the devil wants us to worry we sin. God wants us to feel free after we repent (for we really are free then); the devil is a deceiver). The devil tempts us to cavalier pride before we sin and worrisome despair afterward, since pride and despair both separate us from God, and anything that separates us from God is the devil's friend and our enemy, while anything that brings us close to God is the devil's enemy and our friend.