The Devil automatically has a foothold on us. He has a barrier that stops the blessings of God from comming into our lives. God forgave us, we should fogive each other. I believe it is pride. But you know the Bible, time and time again, says that the proud are fools.
Pride is a stronghold of Satan.
We can easily be prideful without even thinking about it. We do something good, and we think we have accomplished something. But without God you accomplished nothing. We need to pray that God will show us the stongholds we have erected in our lives. Pray that the Holy Spirit will show us the strongholds we have erected in our lives.