The Christian formula for the Trinity-God is one essence in three persons-may seem to be contradictory because we are accustomed to seeing one being as one person. We cannot conceive of how one being could be contained in three persons and still be only one being. To that extent, the doctrine of the Trinity in this formulation is mysterious; it boggles the mind to think of a being who is absolutely one in His essence yet three in person.
( R.C. Sproul )
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