The preceding volume in its entirety and in every part is nothing else than a book of spiritual self-discipline. Every religion presents to its followers as real objects that the eye has not seen. The certainty of the existence of these objects, religious certainty, religious conviction, springs from one or other kind of need and distress. The object that the eye has not seen is believed in because it corresponds to that need, and relieves that distress. Furthermore, the conviction is strengthened, the certainty intensified, by two methods: (1) elaboration of the ideas presented; (2) performing acts in the doing of which the existence of the objects is presupposed. Thus the idea of the Heavenly Father corresponds to the childlike need of protection. The elaboration of this idea in theological systems strengthens its hold, every idea being powerful as an active force in proportion as it is worked out in detail and linked up with other ideas. And ceremonies, prayers, acts of worship in the doing of which the reality of the Father-God is presupposed, strengthen the belief in him. Conduct is one of the chief sources of belief. The more frequently a devout Roman Catholic prays to the Virgin Mary, the more firmly will he be convinced that she exists and hears him. These features are common to all religion: unseen objects are presented as real; the belief in their reality is augmented by elaboration of the ideas; and above all their hold is reinforced by practice founded on and presuming the reality of the ideas. The unseen object which the religion of spiritual experience presents is the unique personality. The lines along which the ideas are to be elaborated have been sketched in the above. Conduct based on the presumption that the divine nature exists in every human being is the principal means of fortifying that conviction, and this presumption itself rests on the fundamental fact of worth. The difference in rank between the various religions depends on the kind of need which they seek to satisfy. It may be physical, as when the worshiper prays for large herds and fruitful crops. It may be the urging of a passion, as when a man prays for revenge on his enemies. And it may be ethical. And if ethical, it may be purely ethical, or ethical with non-ethical elements admixed. A religion is neither approved nor condemned because it satisfies a need. The judgment passed on it depends on the kind of need it undertakes to satisfy. Seek to raise the plus traits to the Nth degree. Seek through spiritual sex interaction to release the spiritual life in the child. Bring to birth in thyself the idea of the state, etc. Every chapter of this volume contains some direction as to the lines of conduct to be followed. The principal self-discipline consists in the effort to follow these lines. But experience tells us that the effort may be hindered or helped in certain ways. I shall mention a few of the helps and hindrances: