Its permanence near to me, its unvarying perspective are not a de facto necessity, since such necessity presupposes them: in order that my window may impose upon me a point of view of the church, it is necessary in the first place that my body should impose upon me one of the world; and the first necessity can be merely physical only in virtue of the fact that the second is metaphysical; in short, I am accessible to factual situations only if my nature is such that there are factual situations for me.