Pietist Quotes
It is significant, as William Vaughan remarks in his introduction to Borsch-Supan's catalogue, that churches never appear in Friedrich's work except in the distance, as unreal visions, or as ruins. The visible Church is dead, only the invisible Church, in the heart or revealed through Nature, is alive. This is part of Friedrich's Pietist heritage, a personal religion that refuses all outward forms, all doctrine. To put a landscape on an altar is an aggressive act, as destructive of the old forms as it is creative of a new sensibility.
Caspar David Friedrich
Conduct, practice, is the proof of doctrine, theory. "If any man will do His will - the will of Him that sent me," said Jesus, "he shall know of the doctrine, whether it be of God or whether I speak of myself" (John vii. 17); and there is a well known saying of Pascal: "Begin by taking holy water and you will end by becoming a believer." And pursuing a similar train of thought, Johann Jakob Moser, the pietist, was of the opinion that no atheist or naturalist had the right to regard the Christian religion as void of truth so long as he had not put it to the proof by keeping its precepts and commandments (Ritschl, Geschichte des Pietismus, book viii., 43).
Miguel de Unamuno