“Why, then, did [Ludwig Wittgenstein] so strongly discourage pupils from becoming teachers of philosophy? I think it was because Wittgenstein knew from his own experience that in philosophical thinking there are long periods of darkness and confusion when one just has to wait. In philosophy above all things there is a time to speak and a time to keep silent. Wittgenstein had a great horror of what Schopenhauer once described as ‘professorial philosophy by philosophy professors’: people having to go on talking when really they knew in their own heart that they had nothing of value to say.”

— M. O’C. Drury, Ludwig Wittgenstein: A Symposium. Assessments of the Man and the Philosopher