+The Importance of Sacrifice+ makes itself felt at every sacred site from the enormous quantities of burnt ash before the caves of Serabit to the similar accumulations upon the summit of Mount Hermon. The worshipper believes that the rite {42} brings him into contact with the powers who are to be nourished, invoked, or recompensed. Its prevalence vividly indicates man's dependence upon them throughout the seasons of the year and on the great occasions of life: birth, circumcision (already practised in our period), marriage and death. Underlying the sacrifice is the profound significance of blood. It is the seat of existence; it has potent virtues whether for protection, expiation, or purification; and the utmost care is taken to dispose of it according to established usage. The fat, too, has no less its living qualities, and since the oldest unguents were animal fats--modern usage is often content with butter--it is probable that anointing originally had a deeper meaning than would at first appear. Wanton bloodshed called for vengeance, and when a Babylonian king demanded that Ikhnaton should slay the Canaanites who had killed his merchants, and thus 'bring back their blood' and prevent retaliation, the inveterate blood-revenge of primitive social life finds an early illustration. But as a sacrifice, the slaughter of human victims, though perhaps not regular, was at least not exceptional, and the frightful bloodshed which the Old Testament attests emphasises the difficulties which confronted those teachers {43} of Israel who would disassociate their national God from an inveterate practice (Ezek. xvi. 20 _sq._, xx. 31).