Quotes from Wilhelm Jerusalem's books, and about them
Vita Sexualis on Introduction to Philosophy: “One day Kanai saw a student in the classroom holding a small book, Jerusalem's Introduction to Philosophy. After the lecture he picked it up and asked what kind of book it was. The student said it had come into the bookshop and he had bought it thinking it might serve as a reference, and Kanai borrowed it and read it that evening. [auto-translated]”
An Inquiry into the Good on Introduction to Philosophy: “As Jerusalem and others hold, the scientific notion that forces act upon the external world must be regarded as an analogy drawn from our own will (Jerusalem, Introduction to Philosophy, section 27). [auto-translated]”