This is usually done indirectly. The real life example of St. Monica praying for her son St. Augustine brought graces of good action (actual graces) upon Augustine. These were imposed upon Augustine without his consent, but they led to a change in his free will toward God and salvation. We observe that the devil acts within the willful boundaries allowed by God. Exorcism of devils is God’s will enforced over the objections and will of demons. Catholic Bishop Robert Barron gives video lectures on the idea of uninhabited Hell and many other topics on YouTube.com.