quote to think ?

i got this quote from my religious teacher's board
the quote is
forgiving is a very powerful thing,
and especially when you can forget it too.

i would like to ask people that what do they think of the quote?
do you agree with the quote ?
i think i agree with this quote cox forgiving is a very hard thing
and i think that i would not so easily to forget sumthing
but i will only forgive the person ...