2 Corinthians 2:9-11 (NLT)
9 The reason I wrote you was to see if you would stand the test and be obedient in everything. 10 If you forgive anyone, I also forgive him. And what I have forgiven—if there was anything to forgive—I have forgiven in the sight of Christ for your sake, 11 in order that Satan might not outwit us. For we are not unaware of his schemes.

There are three points Paul is making in these verses: one, to remain obedient and stand against tests that might come your way; two, learn to forgive; three, remember Satan’s schemes when we fail to follow God’s word.

Resist and rebuke the devil in the name of Jesus. There are several verses which indicate we should do this:
“Yet Michael the archangel, in contending with the devil…dared not bring against him a reviling accusation, but said, “The Lord rebuke you!” Jude 1:9

“Therefore humble yourselves under the mighty hand of God…casting all your care upon Him, for He cares for you…your adversary the devil walks about like a roaring lion, seeking whom he may devour. Resist him, steadfast in the faith…” -1 Peter 5:6-9

“… I have forgiven that one for your sakes in the presence of Christ, lest Satan take advantage of us; for we are not ignorant of his devices.” -2 Corinthians 2:9-11

God wants you and I to understand the scheme’s of the devil so we can have victory in life. Think of Job who dealt with the loss of possessions, the loss of family, and then the loss of his health. Job had no clue Satan was against him. But we have been warned and we must be on guard. Satan can use our unforgiving hearts against us. When we don’t forgive bitterness is brought upon us. The bitterness wells up within until we reach a point where we might reach out and sin. We must be willing to confess our bitterness and our need to forgive to the Lord. Pray Lord Jesus, thank you for dying on the cross for my sins. I agree with you word that I need to forgive and remove the bitterness from my heart. I ask for your strength to obey and not fall victim to Satan or my own flesh. It is in Jesus name I pray, Amen.