Reply Obj. 3: The assault of the flesh and the world would suffice for the exercise of human weakness: but it does not suffice for the demon's malice, which makes use of both the above in assailing men. But by the Divine ordinance this tends to the glory of the elect.
 Thomas Aquinas, Summa Theologica (1274). copy citation

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Author Thomas Aquinas
Source Summa Theologica
Topic weakness glory
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17611/pg17611-images.html

Context

“2: 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. Wherefore (4 Kings 6:16) , Eliseus said to his servant: "Fear not, for there are more with us than with them."
Reply Obj. 3: The assault of the flesh and the world would suffice for the exercise of human weakness: but it does not suffice for the demon's malice, which makes use of both the above in assailing men. But by the Divine ordinance this tends to the glory of the elect. _______________________
SECOND ARTICLE [I, Q. 114, Art. 2]
Whether to Tempt Is Proper to the Devil?
Objection 1: It would seem that to tempt is not proper to the devil. For God is said to tempt, according to Gen.” source