641. As this man of the church must be reformed as to that part of man which is called the understanding, before he could be reformed as to the other part which is called the will, it is here described how the things of the will were separated from those of the understanding, and were as it were covered over and reserved, lest anything should touch the will. For if things of the will, that is of cupidity, had been excited, the man would have perished, as will appear, of the Lord's Divine mercy, hereafter. These two parts-the will and the understanding-are so distinct in man that nothing could be more distinct, as has been given me also to know with certainty from the fact that things of the understanding of spirits and angels flow into the left part of the head or brain, and things of the will into the right; and it is the same with respect to the face. When angelic spirits flow in, they do so gently like the softest breaths of air; but when evil spirits flow in, it is like an inundation into the left part of the brain with dreadful phantasies and persuasions, and into the right with cupidities, their influx being as it were an inundation of phantasies and cupidities.