What can we learn from the mistakes of Hyper-Calvinism?

I remember listening to a sermon by John Piper on Hyper-Calvinists. I had almost forgotten what distinguished them from Calvinists. This blog post highlights the main points of hyper-calvinists. It caused me to think largley about how we preach the gospel to believers and the unbelievers present. Sometimes in preaching it can come across as [...]