We’ve written on this before. See here for a 1997 article by Zane Hodges. And here is a 2017 article by Shawn Lazar. Here is a 2008 article by me. Here is my recent review of a booklet which argues that assurance is of the essence. So why look at this issue again? Today I ran across a quote from Louis Berkhof, the premier Reformed theologian, concerning this issue.