For we are not contending against flesh and blood, but against the principalities, against the powers, against the world rulers of this present darkness, against the spiritual hosts of wickedness in the heavenly places.

 The devil’s knowledge is very wide, in every field. He even knows the verses of the Bible very well and uses them in fighting people such as theologians. In the temptation on the mount, he used the Holy Bible in his own way (Matt. 4:6). He is even the author of all heresies and heterodoxies. He put them in the minds of heretics and offered them wrong concepts for the verses of the Bible. True are the words of St. Athanasius the apostolic, "Our enemy is not the Arians but the devil."

Pope Shenouda III

from “Diabolic Wars”