In their murmuring for water the people had said, “Is the Lord among us, or not?” 1Exodus 17:7. The Lord answered that question in a most practical way. He stood upon the rock in Horeb, and gave them water that they might drink and live. He was really there in person. It was His Real Presence. He was there none the less because they could not see Him. And as He was giving them evidence that He was not far from every one of them, so, if they had felt after Him by faith they would have found and received Him, and His Real Presence would have been in them by means of the water which they drank, as well as by the food that they ate. EVCO 271.1