Therefore, it should not be surprising for Satan's ministers to disguise themselves as ministers of righteousness. Their [final] end will be what they deserve for such actions.

To keep me from becoming conceited because of the exceptional nature of these revelations, a thorn was given to me and placed in my body. It was Satan's messenger to keep on tormenting me so that I would not become conceited.

No wonder! for Satan himself disguises himself as an angel of light.

Lest we should be overreached by Satan, for, of his thoughts, we are not ignorant.

And to whom ye forgive any thing, I also forgive it: for if I have forgiven any thing, I forgave it him, to whom I did forgive it, for your sakes, in the person of Christ; that we might not be foiled by Satan:

For the god of this world [i.e., Satan] has blinded the minds of the unbelievers, so that they would not see the light of the Gospel of the splendor of Christ, who is the image of God.

Do ye look on things after the outward appearance? If any man trust to himself that he is Christ's, let him of himself think this again, that, as he is Christ's, even so are we Christ's.

Instead, we have renounced shameful secret things, not walking in deceit or distorting God’s message, but commending ourselves to every person’s conscience in God’s sight by an open display of the truth.