Some really good thoughts on the preaching of grace summarised below:
1) Young people have a difficult time understanding grace. I think that young people are so used to living in a world of rules and grades, so used to competition and being told to be good/do right, that the Gospel is hard for them to understand.
2) Another reason young people struggle with the Gospel of grace is that they’ve been the primary focus of all the cultural warfare Christians talk about.
3) I think it’s provable again and again that what we are comfortable saying to an unbeliever, we aren’t comfortable saying to a Christian. The Gospel is for Christians, too.
4) We really don’t believe grace can conform our lives to Christ more effectively than law. I mean we don’t. We think we need the law to keep us in line. Especially, we think we need the terrors of the law to frighten us into being good Christians.
5) Here’s one always sure to get a rise out of evangelicals. “Once you are justified by faith, you can do what you want. And if you want to do all the things you did before you knew Jesus, then you just don’t get it.” The idea that we can do what we want just gets everyone nervous.
6) How does grace change us? The Holy Spirit gives us a new heart, the mind of Christ, new affections. We are changed and the promises of sanctification and perseverance are true. But the law can’t PRODUCE anything worthwhile in my life as a Christian.
I would recommend going to the post itself to see what he has to say in more detail. It's superb!