Katsu (the words uttered when reprove persons are practicing asceticism in Zen Buddhism) which says that there is no difference in social standing in the mental status of mediation and that people in mediation are all Buddha equally, is a kind of metaphysical matter of expediency to promote Shikantaza.
坐禅の境地には上下なく、坐禅すれば等しく仏であるという喝も、只管打坐を奨励する一種の暗喩的方便である。