Theology moves back and forth between two poles, the eternal truth of its foundations and the temporal situation in which the eternal truth must be received.
Paul TillichOur search for such [moral] principles can start with . . . the unconditional imperative to acknowledge every person as a person. If we ask for the contents given by this absolute, we find, first, something negative-the command not to treat a person as a thing. This seems little, but it is much. It is the core of the principle of justice.
Paul Tillich