Seems silly, another pile of rocks, but their children knew that pile meant something and so as kids asked, “What are those rocks for?” Israelite Mamas and Dads would tell of the awesome things God did…and the faith of the children grew. They knew that if he did it before he can do it again. They were counting the moments.
Why do we need to get vaccinated? Why do we take vitamins? In case we are exposed to a disease and our body has the strength and defense to fight it off. Psalm 139 is like a vaccine or vitamin.