Abstract
Arevision of the 19th century debate and of the actual discussion about a protestant principle shows that the most precise description of that principle might be given by connecting mankind's immediate encounter with God and human self-differentiation. It is argued that this principle is above all of outstanding hermeneutical value, because it opens a series of approaches to self-understanding, bothin the field of christian faith and of christian ethics. Moreover, it relates protestantism with the innumerable multitude of other self-interpretations, in worldwide christianity as weil as in modern multicultural society, and provokes efforts of mutual understanding.