Forgiveness is related to the biggest action a human can take in life and has been given major importance in Buddhism, Jainism and Sanatna.
Why So ?
This is purely on the soul which carries some kind of grudge and revenge feeling, is inviting rather opening door for negative energy with in and creating a place for that.
Negative thought is considered to be self distructive and a man can never able to prosper. And it become heavier day by day unless people start avoiding you.
Once you have forgiven everyone in your way, suddenly the big change takes place and people start feeling day by day. The thoughts will have no past instance feeling and this will give us a clean unbiased present which help to plan better future.
Remember your Mistakes, Not Revenges...
Whatever you Think, you become -- Buddha
With Love
Ajay