Knowing God is more than knowing about him; it is a matter of dealing with him as he opens up to you, and being dealt with by him as he takes knowledge of you. Knowing about him is a necessary precondition of trusting in him (‘how could they have faith in one they had never heard of?’ [Romans 10:4 NEB]), but the width of our knowledge about him is no gauge of the depth of our knowledge of him (pp. 39-40).
J.I. Packer, Knowing God
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