Chapter XXI. How covetousness can be conquered. And in this case it will be the greatest victory and a lasting triumph, if, as is said, the conscience of the monk is not defiled by the possession of the smallest coin. For it is an impossibility for him who, overcome in the matter of a small possession, has once admitted into his heart a root of evil desire, not to be inflamed presently with the heat of a still greater desire. For the soldier of Christ will be victorious and in safety, and free from all the attacks of desire, so long as this most evil spirit does not implant in his heart a seed of this desire. Wherefore, though in the matter of all kinds of sins we ought ordinarily to watch the serpent’s head, 901 yet in this above all we should be more keenly on our guard. For if it has been admitted it will grow by feeding on itself, and will kindle for itself a worse fire. And so we must not only guard against the possession of money, but also must expel from our souls the desire for it. For we should not so much avoid the results of covetousness, as cut off by the roots all disposition towards it. For it will do no good not to possess money, if there exists in us the desire for getting it. 901     Gen. iii. 15 .