On the Mysteries
IV, Chapter XIII (1)
Consider, therefore, also another genus of causes; how a stone or a herb frequently possess from themselves a nature corruptive, or again collective of generated natures. For this is not only the case with these, but this physical power is also in greater natures and greater things, which those who are not able to infer by a reasoning process, will perhaps transfer the works and energies of nature to more excellent beings [ i. e. to Gods, angels, and dæmons]. Now, therefore, it is acknowledged that the tribe of evil dæmons has a very extended power in generation, in human affairs, and in such things as subsist about the earth. Hence, why is it wonderful that a tribe of this kind should effect such works as these? For every man is not able to distinguish a good from an evil dæmon, or by what peculiarities the one is separated from the other. Hence those, who are not able to perceive the difference between the two, absurdly reason concerning the cause of them, and refer this cause to genera superior to nature and the dæmoniacal order. If, also, certain powers of a partial soul are assumed in order to effect these things, whether such a soul is detained in body, or has left the testaceous and terrestrial body, but wanders about the places of generation in a turbid and humid spirit; this, indeed, will be a true opinion, but separates the cause of these things at the greatest distance from more excellent natures. By no means, therefore, is that which is divine, or any good dæmon, subservient to the illegal desires of men in venereal concerns. For of these things there are many other causes.
The Works of Dionysius the Areopagite
On Divine Names, Caput IV (23)
Then, are they evil to themselves or to others? If to themselves, they also destroy themselves; but if to others, how destroying, or what destroying?-...
(23) But, neither are the demons evil by nature; for, if they are evil by nature, neither are they from the Good, nor amongst things existing; nor, in fact, did they change from good, being by nature, and always, evil. Then, are they evil to themselves or to others? If to themselves, they also destroy themselves; but if to others, how destroying, or what destroying?--Essence, or power, or energy? If indeed Essence, in the first place, it is not contrary to nature; for they do not destroy things indestructible by nature, but things receptive of destruction. Then, neither is this an evil for every one, and in every case; but, not even any existing thing is destroyed, in so far as it is essence and nature, but by the defect of nature's order, the principle of harmony and proportion lacks the power to remain as it was. But the lack of strength is not complete, for the complete lack of power takes away even the disease and the subject; and such a disease will be even a destruction of itself; so that, such a thing is not an evil, but a defective good, for that which has no part of the Good will not be amongst things which exist. And with regard to the destruction of power and energy the principle is the same. Then, how are the demons, seeing they come into being from God, evil? For the Good brings forth and sustains good things. Yet they are called evil, some one may say. But not as they are (for they are from the Good, and obtained a good being), but, as they are not, by not having had strength, as the Oracles affirm, "to keep their first estate." For in what, tell me, do we affirm that the demons become evil, except in the ceasing in the habit and energy for good things Divine? Otherwise, if the demons are evil by nature, they are always evil; yet evil is unstable. Therefore, if they are always in the same condition, they are not evil; for to be ever the same is a characteristic of the Good. But, if they are not always evil, they are not evil by nature, but by wavering from the angelic good qualities. And they are not altogether without part in the good, in so far as they both are, and live and think, and in one word--as there is a sort of movement of aspiration in them. But they are said to be evil, by reason of their weakness as regards their action according to nature. The evil then, in them, is a turning aside and a stepping out of things befitting themselves, and a missing of aim, and imperfection and impotence, and a weakness and departure, and falling away from the power which preserves their integrity in them. Otherwise, what is evil in demons? An irrational anger--a senseless desire--a headlong fancy.--But these, even if they are in demons, are not altogether, nor in every respect, nor in themselves alone, evils. For even with regard to other living creatures, not the possession of these, but the loss, is both destruction to the creature, and an evil. But the possession saves, and makes to be, the nature of the living creature which possesses them. The tribe of demons then is not evil, so far as it is according to nature, but so far as it is not; and the whole good which was given to them was not changed, but themselves fell from the whole good given. And the angelic gifts which were given to them, we by no means affirm that they were changed, but they exist, and are complete, and all luminous, although the demons themselves do not see, through having blunted their powers of seeing good. So far as they are, they are both from the Good, and are good, and aspire to the Beautiful and the Good, by aspiring to the realities, Being, and Life, and Thought; and by the privation and departure and declension from the good things befitting them, they are called evil, and are evil as regards what they are not: and by aspiring to the non-existent, they aspire to the Evil.