He who sins is of the devil, for the devil has been sinning from the beginning. To this end the Son of God was revealed, that he might destroy the works of the devil.
We have this confidence when we keep His commandments and we do those things that are pleasing in His sight. Then we have power in prayer, because our prayers are not directed towards our self-interest and our own self-aggrandizement, but our prayers are on the things of His kingdom and things for His glory and things whereby others may prosper and be blessed.