I love this quote of Hermann Sasse (HatTip: Paul of CyberBrethren)
Whenever the Law and the Gospel are separated from each other, wherever the connection between the Law and the Gospel is lost, then what Luther said proves itself to be true: Where either the Law or the Gospel is lost, then the other is also thoroughly destroyed. Every form of antinomianism necessarily destroys the Gospel. Where the preaching of the Law does not work the recognition of sins, how is it possible to experience or understand the forgiveness of sins [Gospel]?
This is something I’ve learn to apply in my preaching. It’s part of old-fashioned preaching but it’s what makes the gospel effective in the penitent sinner.