“If it is really true that a man, however timidly and uncertainly, may be a Christian, and that even with the greatest qualifications he may be seriously addressed as such, this means that even as the man he was, is, and will be, he cannot be the same man but has become a very different man. He now lives with a new character in which he is strange to himself and his fellows. For all his identity with himself, he is also different from himself. He has become the bearer of a new name. The compass of what it means for a man to become faithful to the faithful God is not merely underestimated but completely missed if one does not ultimately stand before this fact with helpless astonishment.”
Karl Barth, Church Dogmatics 4.4.1.