For what evolutionary reason did human beings create the concept of "forgiveness"?

Love=Instinct to protect and provide for the mate and/or offspring

Fear=Better safe than sorry survival response

And so on and so forth.

What purpose does forgiveness serve on the primal level and why did it become synonymous with divinity?

I ask this question because I had the phrase To err is human; to forgive, divine stuck in my head all day at work.

which isn’t terrible. yesterday it was the theme to hey jessie bouncing around in there like a misfired .22 slug.