Text Illustrations
This story comes from p131-133 of the The Lion, The Witch and The Wardrobe in The Chronicles of Narnia series.

Peter, the great king, has just slain the evil wolf general Maugrim. Aslan tells him he has blood on his sword. Peter looks down and sees that t is true. He bends down and wipes the blood and wolf-hair off on the grass. Asland dubs him Sir Peter Wolf’s-Bane. And then he says this: "And whatever happens, never forget to wipe your sword."

Sometimes, as we travel through life, we find ourselves in skirmishes. Sometimes in doing the right thing, we wind up disappointing, even hurting other people. Or vice versa. Either way, we can’t let resentment cling to us. It will rust us. It will pollute us. It will dull our blades, as it were.

It’s like when Jesus told his disciples to wipe the dust off their feet when they left unbelieving towns. Don’t let resentment cling to you.