21. And let us strive that wrath rule us not nor lust overcome us, for it is written, |The wrath of man worketh not the righteousness of God. And lust, when it hath conceived, beareth sin, and the sin when it is full grown bringeth forth death .| Thus living, let us keep guard carefully, and as it is written, |keep our hearts with all watchfulness .| For we have terrible and crafty foes -- the evil spirits -- and against them we wrestle, as the Apostle said, |Not against flesh and blood, but against the principalities and against the powers, against the world-rulers of this darkness, against the spiritual hosts of wickedness in the heavenly places .| Great is their number in the air around us , and they are not far from us. Now there are great distinctions among them; and concerning their nature and distinctions much could be said, but such a description is for others of greater powers than we possess. But at this time it is pressing and necessary for us only to know their wiles against ourselves.