A word many people try to avoid to save their reputation or pride. Everyday people get offended, and sometimes they don't know how to let go. Even at many churches, including mine, there are people who hold grudges at other people who hurt them. The worst thing is that bitterness can ruin a person.
Why we won't let go
We are naturally proud and selfish because of sin. So, when we get hurt badly, we get angry and proud. We would rather be bitter for the rest of our lives at that person than forgive. It would take an effort to forgive, but most of the times we would not want to take that chance to forgive and let go.
When we don't get hurt but others do
When it's the hardest to forgive, it is when someone else hurts our loved ones and friends. Oh, how hard it is! All you want to do is give your enemy revenge or pay back for what that person has done to your loved ones. But you can still forgive if you let God work in you.
Letting God help you forgive
Forgiveness is the act of showing humility. We are letting go our pride to show mercy and forgiveness. It is super hard for us to let go, and be humble. However, with God's help, we can forgive. If Jesus could ask forgiveness to His Father for those who treated Him unjustly, while He was dying on the Cross, we can have the strength through Him to forgive.
Here is what the Bible say:
"Bear with each other and forgive one another if any of you has a grievance against someone. Forgive as the Lord forgave you."
Colossians 3:13 NIV