“this work is very helpful in that it assures Christians, who know Jesus Christ as Savior and Lord, that they are already “home” and will spend eternity with him in Heaven.”
Hm...do we need anything but scripture to tell us this?
If people really accept Scripture as the divinely-inspired Word of God with which the indwelling Holy Spirit guides into all truth, then, no, Scripture should be sufficient. But, with the nearly daily presence of Roman Catholic threads disparaging Christians who are not Catholics and who warn that hellfire awaits those who reject their church's teachings and who don't "come home" to Catholicism, then I think it is helpful to hear what others think about that idea. It's helpful also to hear what Scripture says and how the early Christians understood those words in their walk of faith because of their proximity to the Apostles and their direct disciples. I trust Scripture far more than I do a fallible man - even if he presumes he is infallible!