What do you think about God? Have you ever been afraid to follow a thought trail about God because you were worried about where it would go or concerned you might have a "dangerous" thought? Theological brain storms can move a lot of stale brain-air and refresh the cavities of one's mind. But things move in strong winds.
When we think wild thoughts about God we need tent pegs to keep our tents from flying off in a storm of confusion. Or maybe like in the Old Testament, we need piles of rocks we can use as reminders when we see them. The Hebrew nation crossed the Jordan river into the promised land and God told each tribe to gather a large stone and pile them together for a place of remembering so they could tell their children. We need stones for remembering.
No one can tell you what your own Theological stones look like. You have to drive down your own tent pegs. You have to discover your own rocks; you must work it out in fear and trembling; you've got to find the theological foundations - those stones of remembering - which you can hang onto and which give you the courage and security to think wildly about God and ask fearful questions.