The wicked angels assail men in two ways. For punishment is referred to God as its first author. In order that the conditions of the fight be not unequal, there is as regards man the promised recompense, to be gained principally through the grace of God, secondarily through the guardianship of the angels. But by the Divine ordinance this tends to the glory of the elect. It would seem that to tempt is not proper to the devil.
Moreover man is tempted by the flesh and the world.
Again, man is said to tempt God, and to tempt man. Therefore it is not proper to the devil to tempt. Objection 2 Further, to tempt is a sign of ignorance. But the demons know what happens among men. Therefore the demons do not tempt.