Knowing God is a matter of personal dealing, as is all direct acquaintance with personal beings. 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…but the width of our knowledge about him is no gauge of the depth of our knowledge of him.
John Owen and John Calvin knew more theology than John Bunyan or Billy Bray, but who would deny that the latter pair knew their God every bit as well as the former?…If the decisive factor was notional correctness, then obviously the most learned biblical scholars would know God better than anyone else. But it is not; you can have all the right notions in your head without ever tasting in your heart the realities to which they refer; and a simple Bible reader and sermon hearer who is full of the Holy Spirit will develop a far deeper acquaintance with his God and Savior than a more learned scholar who is content with being theologically correct. The reason is that the former will deal with God regarding the practical application of truth to his life, whereas the latter will not.