This reading comes from Thomas Watson's the Doctrine of Repentance. If you are new to the Puritans, Watson is by far one of the easiest to read, and most quotable. This section is especially helpful and soul-stirring.
Romans 7:11-13, "For sin, seizing an opportunity through the commandment, deceived me and through it killed me. So the law is holy, and the commandment is holy and righteous and good. Did that which is good, then, bring death to me? By no means! It was sin, producing death in me through what is good, in order that sin might be shown to be sin, and through the commandment might become sinful beyond measure."