"It is necessary, therefore, to prove clearly that in the Early Church, at least, Christianity was no whit behind other great religions in possessing a hidden side, and that it guarded, as a priceless treasure, the secrets revealed only to a select few in its Mysteries. But ere doing this it will be well to consider the whole question of this hidden side of religions, and to see why such a side must exist if a religion is to be strong and stable; for thus its existence in Christianity will appear as a foregone conclusion, and the references to it in the writings of the Christian Fathers will appear simple and natural instead of surprising and unintelligible. As a historical fact, the existence of this esotericism is demonstrable; but it may also be shown that intellectually it is a necessity."