I've taken this text still from "An Introduction to Suf Doctrine", by Titus Burckhardt, p. 37-38
An insight into how true inspiration works thru the soul of man.
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To show how discrimination of the soul is inspired by cosmological principles, certain very general criteria of inspiration (al-warid) may be cited by way of illustration.
It must, however, first be made clear that inspiration is here taken, not in the sense of prophetic inspiration, but in the sense of the sudden intuition normally provoked by spiritual practices. This inspiration may have very different sources, but is only valid when it comes from the centre of man's being outside time or from the "Angel," in other words from the ray of Universal Intelligence connecting man to God.
It is deceptive when it is derived from the psychic world,
1) whether it comes on the one hand from the individual psyche, or the subtle medium in which the psyche lives, or, on the other hand,
2) through the human psyche from the sub-human world and its satanic pole.
Inspiration which comes from the Angel, and so implicitly from God, always communicates a new perception which illuminates the "I" and at the same time relativises it by dissolving certain of its illusions.
When inspiration comes from the individual psyche it speaks for some hidden passion and so has something egocentric about it and is accompanied by some direct or indirect pretentiousness. As for inspirations which emanate from the satanic pole, these go so far as to invert hierarchical relationships and to deny higher realities. Impulsions which come from the individual or collective soul insist tirelessly on the same object-the object of some desire-whereas the satanic influence only makes use provisionally of some lure of passion:
what it really seeks is not the object of passion but the implicit negation of a spiritual reality; that is why the devil routs discussion by changing his "theme" every time his argument is destroyed. He argues only to trouble man whereas the passional soul has a certain logical consecutiveness so that its impulsions can be directed into legitimate channels by dint of sufficiently decisive arguments,
whereas satanic impulsions must simply be rejected in toto.
The three tendencies in question respectively correspond 1) to reintegration into the Essence, 2) to a centrifugal dispersion and 3) to a "fall" into sub-human chaos, and they have their analogies in the universal order. Hinduism calls them sattva, rajas and tamas.