Prepare the dry cornbread mix according to package directions. Cool and crumble.
Preheat oven to 350F, grease one 9x13 inch baking dish.
In a large skillet over medium heat, melt butter and saute the celery and onion until soft
In a large bowl, combine the celery, onions, 3 cups crumbled corn bread, eggs, chicken stock, sage and salt and pepper to taste; mix well.
Place into prepared dish and bake at 350F for 30 minutes.