Recently we proposed “quantum language”which was characterized as the metaphysical and linguistic turn of quantum mechanics. This turn from physics to language does not only realize the remarkable extension of quantum mechanics but also yield the quantum mechanical world view. And thus, the turn urges us to dream that Western philosophies (i.e., Parmenides, Plato, Descartes, John Locke, Berkeley, Hume, Kant, Wittgenstein, etc.) can be understood in quantum language.
In this paper, from the quantum linguistic point of view, we give the answers of the following two problems.
(i): Has western philosophy made progress? Or what is the measure of "progress"?
(ii):Why has useless western philosophy been prospering?