Writing a metaphysic (a total philosophy), it's good to discover sometimes that -- not knowing it -- one rethought a valid thought. For example, I struggled greatly with the question (my own): "What is a metaphysic (singular)?" Was this a valid question? I took it to be fundamental, therefore it was all the more important that I get it right. Then I discovered much the same in Van Inwagen: "We shall see that the central problems of metaphysics were significantly more unified in the Ancient and Medieval eras. Which raises a question—is there any common feature that unites the problems of contemporary metaphysics?" OBSERVATION: My answer to that is yes -- however, it is not what one said in the past.