They1 have made Satan the master of their affairs, and he has taken them as partners. He has laid eggs and hatched them in their bosoms. He creeps and crawls in their laps. He sees through their eyes, and speaks with their tongues. In this way he has led them to sinfulness and adorned for them foul things like the action of one whom Satan has made partner in his domain and speaks untruth through his tongue.
(2) Ibn al-'Athir, al-Nihayah, II, 50. (kh-t-l )
He has so permeated in their blood and mingled in their spirit that both have become completely unified. Now eyes are theirs but sight is his, the tongue is theirs but the words are his, as the Prophet had said, "Verily, Satan permeates the progeny of Adam like blood." That is, just as the circulation of blood does not stop, in the same way the quick succession of Satan's evil ideas know no break and he draws man towards evil in sleep and wakefulness, and in every posture, rising or sitting. He so paints them with his dye that their word and action reflect an exact portrait of his word and action. Those whose bosoms shine with the effulgence of faith prevent such evil ideas but some are already ready to welcome those evils and these are the persons who under the garb of Islam are ever after advancement of heresy. 