Forgive those who have injured you -
not because they deserve your forgiveness,
but because you can never be happy until
you release your anger and grant forgiveness.
Forgiving is not a gift to someone else -
Forgiving is your gift to yourself - a great gift - the gift of happiness.
- Jonathan Lockwood Huie

The remedy for wrongs is to forget them.
- Publilius Syrus

Forgiveness is not always easy.
At times, it feels more painful
than the wound we suffered,
to forgive the one that inflicted it.
And yet, there is no peace without forgiveness.
- Marianne Williamson

Forgiveness means letting go of the hope for a better past.
- Lama Surya Das

Forgiveness ... is the finishing of old business
that allows us to experience the present,
free of contamination from the past.
- Joan Borysenko

The Price of Inner Peace is Forgiveness.
 - Jonathan Lockwood Huie

Further reading: How to Forgive and Move On

Stop Anger Before it Stops You 

Forgive Others for Your Own Sake

Forgiveness is Essential to a Great Relationship