The devil's empire is confined to place as well as time: he is the ruler of this lower world, not of the heavenly. The highest the devil can go is the air, called the prince thereof, as being the utmost marches of his empire; he hath nothing to do with the upper world. Heaven fears no devil, and therefore its gates stand always open.
"Behold, the devil shall cast some of you into prison, that ye may be tried; and ye shall have tribulation ten days" (Rev. 2:10). Here are four remarkable limitations upon Satan and his agents in reference to the people of God: a limitation as to the persons—not all, but some; a limitation of the punishment—a prison, not a grave, not hell; a limitation upon them as to the end—for trial, not ruin; and lastly, as to the duration—not as long as they please, but ten days.
Though the devil be the greatest scholar in the world, and though he have more learning than all the men in the world, yet there are many thousand secrets and mysteries in the gospel of grace that he knows not really, spiritually, feelingly, efficaciously, powerfully, thoroughly, and savingly.Privy Key of Heaven
Did [Christ] make His soul an offering for sin to procure men a liberty of sinning? Or was Christ crucified that the body of sin might remain unmortified—yea, get ground and be the more rampant upon it? Is this your kindness to your Friend, to be so in love with His enemies, the spear and the nails that pierced Him, that you will spend and be spent for the service of your lusts? He died that those He died for might live. Live to whom? Not to themselves, but to Him that died for them.