Work on philosophy – like work in Architecture in many respects – is really more a work on oneself. On one’s own conception. On how one sees things. (And what one expects of them.)
WA 4, 124, 10

There is a truth in Schopenhauer’s view that philosophy is an organism, and that a book on philosophy, with a beginning and end, is a sort of contradiction. ... In philosophy matters are not simple enough for us to say ‘Let’s get a rough idea’, for we do not know the country except by knowing the connections between the roads.
L. Wittgenstein, Lecture, 1933