Much of this ritual of sin-transference is altogether independent of the higher gods; it is worked by mesmeric or mimetic or mechanical magic. At a later period it is harmonised with their service and accompanied with prayer; and at this stage we note a curious ritualistic phenomenon. Blood, the primeval source of impurity, becomes itself {121} a purifier, not by the law _similia similibus curantur_, but owing to the growing power of the sacrificial concept. “The blood of bulls and goats can wash away sins,” because the animal that has been consecrated by contact with the altar becomes charged with a divine potency, and its sacred blood, poured over the impure man, absorbs and disperses his impurity. Illustrations are easily gathered from Hellenic ritual,[121.1] which frequently employed the blood of swine for cathartic purposes. On an early vase-painting we see the hero Theseus seated on the altar of God the Atoner with pig’s blood running down his body to cleanse him from the slaughter of the brigands.[121.2] In the Judaic rule the blood of the red heifer was {122} first sprinkled by the priest before the tabernacle of the congregation seven times, but for special purposes of lustration the “water of separation” was used, that is, water made holy by being mingled with the ashes of the heifer that had been burnt. We have a curious illustration of the double character of this water of separation: being consecrated and holy, it was powerful to cleanse away stain and sin: yet its own impure composition was not wholly forgotten, for he who sprinkled the water or touched it was unclean till evening.[122.1] These ideas belong to very old-world thought, yet their reflex abides with us still in the heart of a spiritual creed; for their association is clear with the Christian conception of the transference of sin and of the divine victim that takes upon himself the sins of the people. As far as we have examined it as yet, the concept of a “pure heart” is not necessarily wholly ethical; it is often coexistent with the ideas of sin that do not clearly recognise {123} moral responsibility or the essential difference between deliberate wrong-doing and the ritualistic or accidental or involuntary sin. In the middle stage of ethical-religious growth, an innocent Œdipus may yet be regarded as πᾶς ἄναγνος, impure body and soul. The final point is reached when it is realised that the blood of bulls and goats cannot wash away sin, that nothing external can defile the heart or soul, but only evil thoughts and evil will. This purged and idealised concept will then in the progressive religions revolt against its own parentage, and will prompt the eternal antagonism of the prophet against the ritual priest, of the Christ against the Pharisee.