Referring to the bread from heaven and water from the desert rock God provided the ancient Israelites in the wilderness, E.J. Waggoner wrote:
“They showed that Christ dwells in the heart by faith just as really as the emblems are received into the body; and that just as really as those emblems are assimilated, and become flesh, so really does Christ, the Word, become flesh in all those who receive Him by faith. Christ is formed within by the power of the Spirit.”
– from “The Everlasting Covenant: God’s Promise to Abraham and the World”, Chapter 26, under the subheading The Real Presence. Emphasis supplied.