I have seen so many people in spiritual bondage due to unforgiveness. It is a common source of bondage and demonic harassment, as Jesus warns us about in Matthew 18:23-35.
Matthew 18:34-35, “And his lord was wroth, and delivered him to the tormentors, till he should pay all that was due unto him. So likewise shall my heavenly Father do also unto you, if ye from your hearts forgive not every one his brother their trespasses.”
That is nothing less than a strong literal warning that a person can fall into the hands of demonic spirits for torment and harassment if they are unforgiving and bitter inside. I have seen it again and again, it is not an uncommon scene to find a person harassed by demons because of bitterness in their heart. Bitterness is also known in the Bible as spiritual poison:
Acts 8:23, “For I perceive that thou art in the gall (poison) of bitterness, and in the bond of iniquity.”
Unforgiveness not only gives demons the right or ability to torment us, but it also prevents God from forgiving our own sins! Now this is serious, this means that when we cry out for God’s help, but have unforgiveness in our hearts, He looks down and our sins are before Him. It puts up a wall in our relationship with our heavenly Father. Jesus was very clear that if we are to be forgiven, we cannot be unforgiving towards others:
Matthew 6:15, “But if ye forgive not men their trespasses, neither will your Father forgive your trespasses.”
Beyond this, bitterness is also a very common means for a born again believer to become spiritually defiled, that is, polluted or unclean spiritually:
Hebrews 12:15, “Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled.”
Notice the word ‘many’ in the above verse… this is a very common means for people to become defiled and open themselves up for spiritual harassment from the enemy.