These are Glauben u.
In the preface to the second edition of the Kritik he says that it was necessary to limit speculative reason to a knowledge of phenomena, in order to allow practical reason to proceed from morality to the assumption of God, freedom, and immortality, existing beyond phenomena: " Ich musste also das Wissen aufheben, urn zum Glauben Platz zu machen."
Wundt, starting from a psychology of unitary experience, deduces a consistent metaphysics of no inference of things transcending experience throughout - or rather until he came to the very last sentence of his System der Philosophie (1889), where he suddenly passes from a necessity of " ideals " (Ideen), to a necessity of " faith " (Glauben), without " knowledge " (Wissen).
He wrote also Ueber die Idee der Universitdten (1835), and Ueber geheime Verbindungen auf Universitdten (1835); works on religious subjects, Karikaturen des Heiligsten (1819-1821); Wie ich weeder Lutheraner wurde and was mir das Luthertum ist (1831); Von der falschen Theologie and dem wahren Glauben (new ed., 1831); poetical works, Die Familien Walseth and Leith (1827); Die vier Norweger (1828); Malcolm (1831), collected in 1837 under the title of Novellen.
This was followed by a series of " Physiological Letters " in the Allgemeine Zeitung, by an essay on " Glauben and Wissen," and by the most important piece of this series, " Der Kampf urn die Seele by (Gottingen, 1857).