5. Let us now speak of the second effect which they cause in the soul. This is of many kinds, because the desires weary the soul and torment and darken it, and defile it and weaken it. Of these five things we shall speak separately, in their turn.

6. With regard to the first, it is clear that the desires weary and fatigue the soul; for they are like restless and discontented children, who are ever demanding this or that from their mother, and are never contented. And even as one that digs because he covets a treasure is wearied and fatigued, even so is the soul weary and fatigued in order to attain that which its desires demand of it; and although in the end it may attain it, it is still weary, because it is never satisfied; for, after all, the cisterns which it is digging are broken, and cannot hold water to satisfy thirst. And thus, as Isaias says: Lassus adhuc sitit, et anima ejus vacua est. Which signifies: His desire is empty. And the soul that has desires is wearied and fatigued; for it is like a man that is sick of a fever, who finds himself no better until the fever leaves him, and whose thirst increases with every moment. For, as is said in the Book of Job: Cum satiatus fuerit, artabitur, aestuabit, et omnis dolor inruet super eum. Which signifies: When he has satisfied his desire, he will be the more oppressed and straitened; the heat of desire hath increased in his soul and thus every sorrow will fall upon him. The soul is wearied and fatigued by its desires, because it is wounded and moved and disturbed by them as is water by the winds; in just the same way they disturb it, allowing it not to rest in any place or in any thing soever. And of such a soul says Isaias: Cor impii quasi mare fervens. The heart of the wicked man is like the sea when it rages.’ And he is a wicked man that conquers not his desires. The soul that would fain satisfy its desires grows wearied and fatigued; for it is like one that, being an hungered, opens his mouth that he may sate himself with wind, whereupon, instead of being satisfied, his craving becomes greater, for the wind is no food for him. To this purpose said Jeremias: In desiderio animae sum attraxit ventum amoris sui. As though he were to say: In the desire of his will he snuffed up the wind of his affection. And he then tries to describe the aridity wherein such a soul remains, and warns it, saying: Prohibe pedem tuum a nuditate, et guttur tuum a siti. Which signifies: Keep thy foot (that is, thy thought) from being bare and thy throat from thirst (that is to say, thy will from the indulgence of the desire which causes greater dryness); and, even as the lover is wearied and fatigued upon the day of his hopes, when his attempt has proved to be vain, so the soul is wearied and fatigued by all its desires and by indulgence in them, since they all cause it greater emptiness and hunger; for, as is often said, desire is like the fire, which increases as wood is thrown upon it, and which, when it has consumed the wood, must needs die.