What is the poem Forgiveness By John Greenleaf Whittier about?

Oh, dude, Forgiveness by John Greenleaf Whittier is, like, all about, well, forgiveness. Surprise, surprise! It's basically about, you know, letting go of grudges and moving on from past mistakes. So, like, if you're holding onto some beef with someone, maybe give this poem a read and chill out a bit.