What Does it Mean to Build Your House on the Sand? Moses spoke of the God of Israel as a Rock: “Ascribe ye greatness unto our God. He is the Rock, his work is perfect, … a God of truth and without iniquity.” (Deut. 32:3–4.)David wrote, “the Lord is my rock, and my fortress, … my shield, … my high tower.” (2 Sam. 22:2–3.)Not only is Jesus a Rock, but his gospel also is likened to a rock, a sure foundation. To Peter, who had obtained a testimony of Jesus by the revelation of the Holy Ghost, Jesus said, “Thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.” (Matt. 16:18.)