Most Christians carry unforgiveness as they are confused as to the true nature of forgiveness. They hang on to excuses which trap them in the torment of which Jesus warned. Forgiveness of others is the key to experiencing our own forgiveness.
Some people just never get over being hurt by others! It destroys them physically, emotionally, relationally, and even spiritually. Even the thought of forgiving certain people can make many people angry. Yet, Jesus declared clearly that if we do not forgive every person from our heart that our lives will contain great torment.
Forgiveness of others is one of the most important issues that Christians face. Once a person knows how to forgive and does so, a great burden will be lifted from their life.