Jesus' principle of the greater good (Luke 14:1-6): even if blood transfusion were a moral rule violation, the greater good of saving life would override it.

Luke 14:1-6: Jesus heals a man with dropsy on the Sabbath and defends it with the principle that rescuing a son or ox from a well on the Sabbath is morally justified — even though it violates the Sabbath law. Mike applies this: even if there were something morally problematic about blood transfusion (which he denies), the greater good of preserving life would make it an exception to that rule. The argument that blood symbolizes life is self-defeating: you throw away the actual life to preserve the symbol of life.