Depends on the context in which the great Saint wrote it, IMHO.
Let us therefore repeat that by underlining today the existence of demonic reality the Church intends neither to take us back to the dualistic and Manichaean speculations of former times, nor to propose some rationally acceptable substitute for them. She wishes only to remain faithful to the Gospel and its demands. It is clear that she has never allowed man to rid himself of his responsibility by attributing his faults to the devil. The Church did not hesitate to oppose such escapism when the latter manifested itself, saying with Saint John Chrysostom: “It is not the devil but men’s own carelessness which causes all their falls and all the ills of which they complain” (122).
(122)
De Diabolo Tentatore,
Homil. II,
PG 49, 259.
vatican.va/roman_curia/congregations/cfaith/documents/rc_con_cfaith_doc_19750626_fede-cristiana-demonologia_en.html
Excerpt from De Diabolo Tentatore,
Homil. II2. Perhaps ye have not yet understood what has been said. Therefore it is necessary that I should say it again more clearly. Let there be one antagonist. But let there be also two athletes about to wrestle against him, and of these two athletes let one be consumed with gluttony, unprepared, void of strength, nerveless; but the other diligent, of good habit, passing his time in the wrestling school, in many gymnastic exercises, and exhibiting all the practice which bears upon the contest. If then thou takest away the antagonist, which of these two hast thou injured? The slothful, pray, and unprepared, or the earnest one who has toiled so much? It is quite clear that it is the earnest one: For the one indeed is wronged by the slothful, after the antagonist has been taken away. But the slothful, while he remains, is no longer injured on account of the earnest. For he has fallen, owing to his own slothfulness.
I will state another solution of this question, in order that thou mayest learn, that the Devil does not injure, but their own slothfulness everywhere overthrows those who do not take heed. Let the Devil be allowed to be exceeding wicked, not by nature, but by choice and conviction. For that the Devil is not by nature wicked, learn from his very names. For the Devil, the slanderer that is, is called so from slandering; for he slandered man to God saying “Doth Job reverence thee for nought? but put out thine hand, and touch what he hath, see if he will not blaspheme thee to thy face.”578 He slandered God again to man saying “Fire fell from heaven and burnt up the sheep.”579 For he was anxious to persuade him, that this warfare was stirred up from above, out of the heavens, and he set the servant at variance with the master, and the master with his servant; rather he did not set them at variance, but attempted to indeed, but was not able, in order that whenever thou mayest set another servant at variance with his master, Adam with God, and believing the Devil’s slander, thou mayest learn that he gained strength, not owing to his own power but from that man’s slothfulness and carelessness. He is called the Devil therefore on that account. But to slander, and to refrain from slander is not natural, but an action which takes place and which ceases to take place, occurring and ceasing to occur. Now such things do not reach the rank of the nature or of the essence of a thing. I know that this consideration about essence and accident is hard to be grasped by many. But there are they who are able to lend a finer ear, wherefore also we have spoken these things. Do you wish that I should come to another name? You shall see that that also is not a name which belongs to his essence or nature. He is called wicked. But his wickedness is not from his nature, but from his choice. For even this at one time is present, at another time is absent. Do not thou then say this to me that it always remains with him. For it was not indeed with him at the beginning, but afterwards came upon him; wherefore he is called apostate. Although many men are wicked, he alone is called wicked by pre-eminence. Why then is he thus called? Because though in no way wronged by us, having no grudge whether small or great, when he saw mankind had in honour, he straightway envied him his good. What therefore could be worse than this wickedness, except when hatred and war exist, without having any reasonable cause. Let the Devil then be let alone, and let us bring forward the creation, in order that thou mayest learn that the Devil is not the cause of ills to us, if we would only take heed: in order that thou mayest learn that the weak in choice, and the unprepared, and slothful, even were there no Devil, falls, and casts himself into many a depth of evil. The Devil is evil. I know it myself and it is acknowledged by all, yet give heed strictly to the things which are now about to be said. For they are not ordinary matters, but those about which many words, many times, and in many places arise, about which there is many a fight and battle not only on the part of the faithful against unbelievers but also on the part of the faithful against the faithful. For this is that which is full of pain.
