Every multifaceted entity falls apart unless it depends on one thing, a fact recognized by all sound reasoning whether religious or not. For example, a human being, made up of many limbs, internal organs, sensory organs, and motor organs all interconnected, would fall apart if it did not depend on one soul; and the body itself would fall apart if it did not depend on one heart. A country would fall apart but for its one monarch; a household would fall apart but for its one head; every one of the many workplaces in every country would fall apart but for its one person in charge. What army would prevail against its enemies without a leader who has supreme power, and officers with authority over their soldiers? Likewise a church would fall apart unless it acknowledged one God; and even the angelic heaven would fall apart. Heaven acts as the head of the church on earth; the soul of both is the Lord; this is why heaven and the church are called his body. So if heaven and the church did not acknowledge one God, each would be like a lifeless corpse that would be thrown away and buried because it was good for nothing.
from True Christianity, Volume 1, Section 10