What I am arguing in this post is that
while justification by faith alone is true, if this is as far as a person goes, while they may be justified, they have not understood the gospel.
According to Catholic doctrine man can not judge his
justification or his eternal salvation with absolute certainty
while he is still a pilgrim, and this is ultimately not contradicted
by the Protestant doctrine of
justification either, despite all controversies, because in Lutheranism, too, absolute «fiducial
faith» has always been attacked.