Doubt is an uneasy and dissatisfied state from which we struggle to free ourselves and pass into the state of belief; while the latter is a calm and satisfactory state which we do not wish to avoid, or to change to a belief in anything else.
The self. . . can split off from itself without being less. You are not a mini self, an adjunct to some super-being, never to share fully in its reality. . . you are that superself looking out through only one eye, or using just one finger.