9Marks is deeply interested in the doctrine of conversion (it's the fourth mark) because it's tightly tied to the doctrine of the church. If the church is a house, conversion is the timber. The timber you use will dramatically affect the kind of house you get. Will you include the timber of divine sovereignty? Human responsibility? Repentance? Faith?
Start with Jared Wilson's reflections on the beauty of the doctrine and Owen Strachan's...