Few verses from Matthew 18 explain about forgiveness. Jesus himself tells about forgiveness in this chapter. When I read, I was able to find out the consequences if we don't forgive.
1. Lord was angry (verse 34)
2. You put yourself in prison (verse 30)
3. Delivered him to tormentors (verse 34)
4. Other people affect your choices and dictate your life (verse 30)
5. No answers from the Lord (unanswered prayers), because of unforgiveness (verses 32-33)
6. Relationships will not be okay (verse 31)
1. Lord was angry (verse 34)
2. You put yourself in prison (verse 30)
3. Delivered him to tormentors (verse 34)
4. Other people affect your choices and dictate your life (verse 30)
5. No answers from the Lord (unanswered prayers), because of unforgiveness (verses 32-33)
6. Relationships will not be okay (verse 31)

\o/