There is also something in one's consciousness, which supports this view. When the appetites are entirely subdued and kept in their place, the subject of them, at least so far as the appetites are concerned, feels that he is pure in heart. But when it is otherwise, there is a sense not only of guilt, but of degradation; there is an inward consciousness of what may be termed metaphorically a stain or blot upon the mind. The soul feels itself, in the experience of its own state, to be very different from what it is at other times. The holy soul may be likened to a mirror, into which God may look, and behold the features of his own character reflected. But when it yields itself to the undue influence of the appetites, the mirror becomes stained and darkened, and God is no longer seen in it.
— The Interior or Hidden Life (1844) Part 2, Chapter 3.