The third enemy to conquer is one’s own self.
The way to combat this enemy is to first think of everyone as artisans that are present in your life in order to prove you. In order to “free yourself from the imperfections and disturbances that can be engendered by the mannerisms and attitudes of (others) and draw profit from every occurrence, you should think that all in the community are artisans”.
“Some will fashion you with words, others by deeds, and others with thoughts against you; and that in all this you must be submissive as is the statue to the craftsman who molds it, to the artist who paints it, and to the gilder who embellishes it.”
St. John of the Cross want us to get along well with others in the communities in which we live and in order to do so we need to overcome our sensuality and the way we feel. His goal for us is to attain peace and free us from many stumbling blocks that will trip us up on our way to live charitably with everyone.
Our selfishness and sensuality can keep us from doing something we ought to do because we find it disagreeable. Or it can move us to only do those works that we find delight or satisfaction in doing. St. John of the Cross sees this as a weakness within the soul. We should do whatever is fitting for the service of God. Doing those works we find disagreeable, and doing them well, will aid our striving to conquer our weakness and gain constancy.
Another sensual weakness that needs to be overcome stems from becoming attached to pleasant feelings that can be found in spiritual exercise. This attachment can lead one to carry out these spiritual exercises only for the satisfaction that is experienced in them. St. John of the Cross also counsels, “nor should such a person run from the bitterness that may be found in them, but rather seek the arduous and distasteful and embrace it. By this practice, sensuality is held in check; without this practice you will never lose self-love or gain the love of God.”
(St. John of the Cross Collected Works, ICS Publications, The Precautions)