For beginners there is Isaiah 55:8 "For my thoughts are not your thoughts, neither are your ways my ways". That ought to clue us in.
Then there are the awesome conversations in Job including these questions in Job 11:7 "Can you fathom the mysteries of God? Can you probe the limits of the Almighty? Can you hear the "I dare you to try tone" in that passage?
These are some of my favorites because I just love the paradoxical language:
Psalm 145:3 Great is the Lord and highly to be praised; and His greatness is [so vast and deep as to be] unsearchable. We say He is great. That much we know, and yet simultaneously this greatness is too immense for us.
Isaiah 40:28 Have you never heard? Have you never understood? The Lord is the everlasting God, the Creator of all the earth. He never grows weak or weary. No one can measure the depths of his understanding. Have you never understood the depths of his understanding? Well, no. Is that something I should I be able to do?
It is almost like God is saying, hit me with your best shot. Bring your rulers, your scales, your scientific calculators and just try to measure me. Given all the exceptions to almost every rule, who would want a God that fits into a formula? Who needs peace that makes sense? (Phil 4:7)
One last passage to ponder from Ephesians 3: And I pray that you, being rooted and established in love, may have power, together with all the saints, to grasp how wide and long and high and deep is the love of Christ, and to know this love that surpasses knowledge—that you may be filled to the measure of all the fullness of God.
To KNOW this love that surpasses KNOWLEDGE. Paul was a poet. How can we do that? I'm not sure but Paul prayed that we would. He prayed that we would have power...strength to grasp...spiritual muscles to reach out and hold on to the truth of this amazing love in all it's dimensions. Recently Patsy Cameneti drew my attention to this passage and to the word "together" suggesting that there are some aspects of this amazing love we only understand in the context of community.
Here we are like curious children, seeking to know him. It is an endless quest to exhaust the infinite. God delights in revealing himself to us, but there is always more, isn't there? The amazing part is that even in our falling short we still come out enriched and enlightened and even inspired to continue to search out the unsearchable depths of our Great God. Ah. I love that!