John Calvin on the workings of Satan

1.14.17. With regard to the strife and war which Satan is said to wage with God, it must be understood with this qualification, that Satan cannot possibly do anything against the will and consent of God. For we read in the history of Job, that Satan appears in the presence of God to receive his commands, and dares not proceed to execute any enterprise until he is authorised. In the same way, when Ahab was to be deceived, he undertook to be a lying spirit in the mouth of all the prophets; and on being commissioned by the Lord, proceeds to do so. For this reason, also, the spirit which tormented Saul is said to be an evil spirit from the Lord, because he was, as it were, the scourge by which the misdeeds of the wicked king were punished. In another place it is said that the plagues of Egypt were inflicted by God through the instrumentality of wicked angels. In conformity with these particular examples, Paul declares generally that unbelievers are blinded by God, though he had previously described it as the doing of Satan. It is evident, therefore, that Satan is under the power of God, and is so ruled by his authority, that he must yield obedience to it. Moreover, though we say that Satan resists God, and does works at variance with His works, we at the same time maintain that this contrariety and opposition depend on the permission of God. I now speak not of Satan’s will and endeavour, but only of the result. For the disposition of the devil being wicked, he has no inclination whatever to obey the divine will, but, on the contrary, is wholly bent on contumacy and rebellion. This much, therefore, he has of himself, and his own iniquity, that he eagerly, and of set purpose, opposes God, aiming at those things which he deems most contrary to the will of God. But as God holds him bound and fettered by the curb of his power, he executes those things only for which permission has been given him, and thus, however unwilling, obeys his Creator, being forced, whenever he is required, to do Him service.

-John Calvin, Institutes of the Christian Religion (trans. Henry Beveridge; Accordance electronic ed. Edinburgh: Calvin Translation Society, 1845), n.p.