Pick over the dried beans to remove any small rocks, debris, or imperfect beans.
Rinse the beans with water in a colander and drain well.
Place beans in a large bowl and cover with enough water to have two inches of water on top. Allow to soak overnight.
Preheat oven to 300 degrees.
Drain beans and transfer to oven-proof cooking vessel.
Add garlic, sage, and 1/4 cup of olive oil. Pour in enough water to cover the beans by 1 1/2 inches.
Cover the pot and bake for 2 hours, stirring once halfway through.
Add 1/2 teaspoon salt and recover. Return to oven and bake 1 hour more.
Allow beans to cool at room temperature. Cover and refrigerate.
Bring beans to room temperature. Add salt and pepper to taste. Transfer the beans to a serving bowl with a slotted spoon. Drizzle with 1 tablespoon of olive oil. Sprinkle with freshly minced sage.