The dialogue on the nature of thought between scientist, savant and master reached the public only in 1959 but dates from 1944–45.¹ Who the scientist and savant are we are not told, but who the master is there can be, indeed, no doubt. From the same period (1944–46) comes as well another essay on Nietzsche, entitled "Nihilism in Terms of Being-as-History," which appeared in 1961.² The latter, however, is so clearly a complement to the former that it seems best to treat them as one.