We should just be thankful for being together.

Marcie: Don’t feel bad, Chuck. Peppermint Patty didn’t mean all those things she said. Actually, she really likes you.
Charlie Brown: I don’t feel bad for myself, I just feel bad because I’ve ruined everyone’s Thanksgiving.
Marcie: But Thanksgiving is more than eating, Chuck. You heard what Linus was saying out there. Those early Pilgrims were thankful for what had happened to them, and we should be thankful, too. We should just be thankful for being together. I think that’s what they mean by ‘Thanksgiving,’ Charlie Brown.