Ask a Teacher: What Mantras Can Help My Child Be Confident When Faced with a Bully?

Do you have any favorite internal affirmations or mantras you like to offer students to help them feel confident in the face of potential bullies or put-downs? I'm trying to help out my elementary schooler. Right now I'm thinking of sayings along the lines of "I am awesome just as I am," or "I will not let others define me." Additionally, if there are any great all-purpose verbal comebacks or responses that might be applied generally, those would be helpful and welcome as well. Really, I welcome any suggestions you have for helping my child muster up confidence (with kindness). I speak to my students about this all the time.