Why is it important to seek forgiveness and to forgive?

Could someone please help me with my school project. I need an answer mostly from the Catholic Church.

The following links should help answer your question about forgiveness. If you have any further questions, please contact Catholic Answers directly.
Recommended Reading:**

Scope of forgiveness
The Forgiveness of Sins
The Limits of Forgiveness

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit www.catholic.com.