This chapter is the concluding chapter that briefly summarises the central thesis of the book. The thesis is that Donald Williams was a crucial and important figure in the mid-twentieth century who advocated for metaphysics, during a time when it was unpopular. Logical positivism, ordinary language philosophy, and the later Wittgenstein, it is argued, ought to be understood as revolutionary movements that tried to squash metaphysics and reduce the significance of philosophical thought in the traditional sense. The revival of metaphysics in the analytic tradition, partly at the hands of Williams, is to be understood as a response to these revolutions that reverts to traditional and big questions in philosophy.