Romans 7:13

13 Was then that which is good made death unto me? God forbid. But sin, that it might appear sin, working death in me by that which is good; that sin by the commandment might become exceeding sinful.

Ver. 13. Exceeding sinful ] Sin is so evil that it cannot have a worse epithet given it. Paul can call it no worse than by its own name, "sinful sin."