9 What then of us? Shall we venture to say anything on such words, “I am who am;” or rather on this, that you have heard the Lord saying, “If you believe not that I am, you shall die in your sins”? Shall I venture with these feeble and scarcely existing powers of mine to discuss the meaning of that which Christ the Lord has said, “If you believe not that I am”? I shall venture to ask the Lord Himself. Listen to me as one asking rather than discussing, inquiring rather than assuming, learning rather than teaching, and fail not yourselves also to be asking with me or through me. The Lord Himself, who is everywhere, is also at hand. Let Him hear the feeling that prompts to ask, and grant the fruit of understanding. For in what words, even were it so that I comprehend something, can I convey to your hearts what I comprehend? What voice is adequate? What eloquence sufficient? What powers of intelligence? What faculty of utterance?
Source: Tractates on the Gospel of John (New Advent)