The devil's right. But wait a minute. Think clearly for a moment. He's consistently opposed to my union and yours with the Father. When the devil contests a believer on seemingly righteous grounds you can count on it that there's a trap in the system somewhere.
Truth starts to surface.
The God of all glory is also the God of all grace. Any correct teaching of God's infinite mercy has a way of sounding to the presumptuous like a license for sin. But we don't enter God's presence by presenting an admission card certifying our sinlessness. A proper balance of humility and boldness is needed. Sin, by whatever description, cannot be skirted.