Many years ago the Nobel prize was awarded to the discoverer of a difference in the quality of human blood, which had hindered its use in transfusion. Until then transfusion had been a 'hit or miss' experiment. The donor of the blood might be in perfect health, all conditions might be favourable, but the patient would die. Now it is known that there are several blood groups. The largest is the most important, for blood from it will be accepted by most patients though to some it would be poison.
When the haemorrhage has been stopped after a successful operation, the patient, who has lost much blood, lies pale, listless, exhausted, and it seems that death is only a question of hours. But a suitable blood has been found, and a transfusion effected. The result is magical. Colour comes back to the lips, the pulse beats strongly, and the patient will live, for the patient has shared the life blood of the donor and literally received life from him.
Our Lord's statement as to the all-importance of eating His flesh and drinking His blood cannot refer to a sacrament not then instituted, nor could He mean what the Jews seemed to understand by His words, the actual eating of the Lord's real flesh and drinking His real blood. No! He meant that we must share His life, for 'the life of the flesh is in the blood'. We must receive Him as food, to the nourishment of our souls. He must be appropriated as a personal Savior Who gave Himself for us and shed His blood for the forgiveness of our sins. The Son of God is the universal donor. His blood avails for all.
But usually the life-fluid for a blood transfusion is costly. And sometimes, even if the price can be paid, the patient may belong to a different blood-group from the donor: for there are no universal donors. The most costly thing in the universe is freely offered to sinners by God. It is the blood of Jesus Christ His Son Who gave His life that we might receive that eternal life through His death. It is priceless, yet is offered 'without money and without price'. And it is suited to all sinners, for Christ is the 'universal Donor'.—Selected
(Lev. 17. 11; Matt. 26. 28; I Pet. 1. 18, 19)