Bean Soup with Sausage

2 navy beans, soaked in water overnight and drained

2 olive oil

4 stalks of celery

4 large carrots, peeled and sliced

1 large onion, chopped

2 garlic (chopped)

4 , cut into ½ inch slices

9 chicken stock or broth

2 dried thyme (crushed)

2 bay leaves

salt and freshly ground black pepper, to taste