There is a remarkable phrase in the Bible, here it says, 'Eat My flesh and drink My blood', says Christ. What does He mean by saying this? He means in the first place that what a living being loves most is his food, what he loves most he eats. It has been proved in ferocious and dreadful famines, by people eating their own children, that food is dearer than their own child. The word of Christ, therefore, 'Find out, what it is in Me that you love, which may become your nourishment, which may become your food. It is not this, My flesh and blood; this will not be sufficient to satisfy your appetite. There is another part of My being, which is in abundance and can nourish My numberless devotees. Therefore before trying to eat My flesh and blood, try to find out on what plane I really exist and what is My true being'. The lives of all the great saints show that not only their adversaries and opponents but also their near and dear friends have proved to be among their worst enemies. There is a creature which loves its mate so much that it eats it.
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.
