When law rules a Christian, his focus is on improving his behavior. Yet even if he does manage to improve his behavior, what has he accomplished spiritually? Even an unsaved person can often improve his performance… Joy doesn’t come by doing the right thing. In a lifestyle where grace rules, Jesus is the source of joy.
Steve McVey
Grace Rules, Harvest House 1998, 73
GraceQuotes.com 
Also, and more importantly, salvation doesn’t come by doing the right thing! HalleluYAH!