Werner Elert quotes:

from "Law & Gospel"--

(pp. 42-43) “…In terms of empirical data no such thing as a sinless regenerate person exists…in the earthly empirical life of the regenerate the law constantly exercises also the usus theologicus (a.k.a., the 2nd Use of the Law). It steadfastly convicts him of his sin.”

(p. 47) “He (Calvin) sees in the law the ultimate criterion for measuring man’s relation to God. This means that the gospel did not provide a new way of salvation, but served only to clarify the law…For Calvin, the gospel stands in the service of the law.”