Modern Protestant theology has achieved a great deal in this direction; its evolution has progressed to a complete disintegration of Christianity, by adapting it to modern ideas so thoroughly that there is not a single thought left which this Christianity, reduced to meaningless words, might not accept. This is the relativism of the present subjectivistic reasoning and its consequences. Now, it is true that there is room for a certain relativity and evolution in the field of thought and truth. There is a relative truth in the sense that our knowledge of it is never exhaustive. Even the eternal truths of the Christian religion we always know only imperfectly, and we ought to perfect our knowledge continually; established facts of history can also be known, if studied, in greater detail. Thus there is progress and evolution. But from this we may not conclude that there can be no fixed truths at all. In the astronomy of to-day one can surely have the conviction that the fundamental truths of _Copernicus’s_ System of the Universe must remain an unchangeable truth, and that the time will never come when we shall go back to the obsolete doctrines of old _Ptolemy_, who made the sun revolve around the earth. Is astronomy therefore excluded from progress and evolution? It is moreover true that the individual as well as the community pass through an intellectual evolution in the sense that they gradually increase their knowledge and correct their errors, that literature and the schools gradually enhance the energy and wealth of our ideas and thoughts.