Final Justice: The Return of Christ by John MacArthur
@canonpress I want to share an extensive block quote from the book for two reasons: (1) it is a very good quote, I might've even read it in my application of the text if I had known about it at the time, (2) I hope it spurs you on to go and buy this book and read the rest of the great content within it.
Paul never minces words with those who syncretize other ideas into the gospel and thus create a false gospel. He is direct and forthright about the dangers of straying from the gospel.
Every Wednesday night since August 2018, I have been preaching through the book of Joshua. The first of the Former Prophets. I have never preached an Old Testament book all the way through. It was so eye-opening, challenging, and rewarding.
A syncretistic heresy had crept into the church, and Paul was eager to see them through this to see Christ as all-sufficient. The only way they could make it through this is if Christ and Christ alone was the place where they planted their roots.