God could not be known in Old Testament times. He had not come out, and man could not go in. Now, God is revealed in three Persons, and this could not be true until the Son had come. The Son declares the Father, and the declaration is made good in us by the indwelling of the Spirit. God is known. "This is life eternal, that they might know Thee, the only true God, and Jesus Christ whom Thou hast sent." Without the three, it is clear that God cannot be known, since He has been pleased to make Himself known in this way. We are shut up to these Three. H. C. Anstey.