The second characteristic property of a Sacrament belongs to the facts of the invisible worlds, and is studied by occult science. The person who officiates in the Sacrament should possess this knowledge, as much, though not all, of the operative power of the Sacrament depends on the knowledge of the officiator. A Sacrament links the material world with the subtle and invisible regions to which that world is related; it is a link between the visible and the invisible. And it is not only a link between this world and other worlds, but it is also a method by which the energies of the invisible world are transmuted into action in the physical; an actual method of changing energies of one kind into energies of another, as literally as in the galvanic cell chemical energies are changed into electrical. The essence of all energies is one and the same, whether in the visible or invisible worlds; but the energies differ according to the grades of matter through which they manifest. A Sacrament serves as a kind of crucible in which spiritual alchemy takes place. An energy placed in this crucible and subjected to certain manipulations comes forth different in expression. Thus an energy of a subtle kind, belonging to one of the higher regions of the universe, may be brought into direct relation with people living in the physical world, and may be made to affect them in the physical world as well as in its own realm; the Sacrament forms the last bridge from the invisible to the visible, and enables the energies to be directly applied to those who fulfil the necessary conditions and who take part in the Sacrament. The Sacraments of the Christian Church lost much of their dignity and of the recognition of their occult power among those who separated from the Roman Catholic Church at the time of the "Reformation." The previous separation between the East and the West, leaving the Greek Orthodox Church on the one side and the Roman Church on the other, in no way affected belief in the Sacraments. They remained in both great communities as the recognised links between the seen and the unseen, and sanctified the life of the believer from cradle to grave. The Seven Sacraments of Christianity cover the whole of life, from the welcome of Baptism to the farewell of Extreme Unction. They were established by Occultists, by men who knew the invisible worlds; and the materials used, the words spoken, the signs made, were all deliberately chosen and arranged with a view to bringing about certain results.