Detachment

Wherefore, if the soul rejects and denies that which it can receive through the senses, we can quite well say that it remains, as it were, in darkness and empty; since, as appears from what has been said, no light can enter it, in the course of nature, by any other means of illumination than those aforementioned. For, although it is true that the soul cannot help hearing and seeing and smelling and tasting and touching, this is of no greater import, nor, if the soul denies and rejects the object, is it hindered more than if it saw it not, heard it not, etc. Just so a man who desires to shut his eyes will remain in darkness, like the blind man who has not the faculty of sight. And to this purpose David says these words: Pauper sum ego, et in laboribus a indenture mea.⁸⁵Psalm lxxxvii, 16 [A.V., lxxxviii, 15]. Which signifies: I am poor and in labours from my youth. He calls himself poor, although it is clear that he was rich, because his will was not set upon riches, and thus it was as though he were really poor. But if he had not been really poor and had not been so in his will, he would not have been truly poor, for his soul, as far as its desire was concerned, would have been rich and replete.

For that reason we call this detachment night to the soul, for we are not treating here of the lack of things, since this implies no detachment on the part of the soul if it has a desire for them; but we are treating of the detachment from them of the taste and desire, for it is this that leaves the soul free and void of them, although it may have them; for it is not the things of this world that either occupy the soul or cause it harm, since they enter it not, but rather the will and desire for them, for it is these that dwell within it.

- St. John of the Cross, Ascent of Mount Carmel, Bk 1; Ch. 3:4