Unexpected Side-Effect
In the metro I've just been reading a couple of pages from Luce Irigaray's Ethic de la difference sexuelle. It was a fascinating experience because I didn't understand a single sentence. I couldn't even find out what the book is about, except that it has something to do with sex.
This reminded me of a puzzling phenomenon I've noticed for some time now: The longer I study philosophy, the less I understand most philosophers. I remember that when I read Kant's Kritik der reinen Vernunft after leaving school, I thought I understood at least roughly what is going on. A while ago, I had to look up his "refutation of idealism" and felt completely lost.