Now as to the question what it is that Christ speaks of as his flesh and blood: His flesh is the knowledge of God and His blood is the love of God; because it is love that has a tendency, so to speak, to excite the circulation, and it is knowledge which has the tendency to strengthen, making man firm, of which flesh is the symbol. One thing without the other would be abnormal. For instance flesh without blood, or blood without flesh, both are not normal conditions. What gives normal health to the body and to the soul is flesh and blood both. In the religious custom of the sacrament of bread and wine it is this secret which is symbolically expressed.