The Pastoral Impact of Our Theology

I think all of us of FGA realize the impact theology can have at the pastoral level. Consider the advice from Dr. John Piper, noted pastor, prolific author, and reformed theologian.
“When I confronted a man about the adultery he was living in, I tried to understand his situation, and I pled with him to return to his wife. Then I said, “You know, Jesus says that if you don’t fight this sin with the kind of seriousness that is willing to gouge out your own eye, you will go to hell and suffer there forever.”
As a professing Christian, he looked at me in utter disbelief, as though he had never heard anything like this in his life, and said, “You mean you think a person can lose his salvation?”
So I have learned again and again from firsthand experience that there are many professing Christians who have a view of salvation that disconnects it from real life, and that nullifies the threats of the Bible, and puts the sinning person who claims to be a Christian beyond the reach of biblical warnings. I believe this view of the Christian life is comforting thousands who are on the broad way that leads to destruction (Matthew 7:13).
Jesus said, if you don’t fight lust, you won’t go to heaven. Not that saints always succeed. The issue is that we resolve to fight, not that we succeed flawlessly.”

This is a quote from Piper’s book, “Future Grace” published in 1995, page 331. This selection is offered in the daily devotional called “Solid Joys” posted July 27, 2013, over 18 years after its original publication. Think about the impact this could have on a Christian, especially one with a weak conscience or one that has difficulty with certain sins. Think about the theology that leads to such a statement. 
This is the theology that Dr. Piper received from his teacher, Dr. Dan Fuller, (“The Unity of the Bible” 1992 Zondervan) who he credits in “Future Grace” as being totally influential in his theological convictions. Dr. Fuller and Piper take it back to Jonathan Edwards. And of course all of the above would go back to John Calvin, who in his “Institutes” put it so eloquently - “Thus it appears how true it is that we are justified not without, and yet not by works.” (Institutes 2:98-99)  
I hope you are ready to explain how you would respond to such a theology.