From “The Three-Personal God”:
You may ask, “If we cannot imagine a three-personal Being, what is the good of talking about Him?” Well, there isn’t any good talking about Him. The thing that matters is being actually drawn into that three-personal life, and that may begin any time–tonight, if you like.
What I mean is this. An ordinary simple Christian kneels down to say his prayers. He is trying to get in touch with God. But if he is a Christian he knows that what is prompting him to pray is also God: God, so to speak, inside him. But he also knows that all his real knowledge of God comes through Christ, the Man who was God–that Christ is standing beside him, helping him to pray, praying for him. You see what is happening. God is the thing to which he is praying–the goal he is trying to reach. God is also the thing inside him which is pushing him on–the motive power. God is also the road or bridge along which he is being pushed to that goal. So the whole three-fold life of the three-personal Being is actually going on in that ordinary little bedroom where an ordinary man is saying his prayers.