He was perhaps the most perfect example I have ever known of genius as traditionally conceived, passionate, profound, intense and dominating.
Bertrand Russell

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