Why does the Bible refer to Christ as a rock?

Christ as the rock symbolizes His eternal stability and strength, serving as a foundation on which believers can stand firm. In various scriptures, including Psalm 18:2 and Matthew 7:24-25, God’s promises and faithfulness are compared to a rock, depicting Christ as trustworthy and unshakeable. As the rock provides water for the thirsty, Christ offers spiritual life and sustenance. This imagery provides believers assurance of their security in Christ amid life's challenges, emphasizing His role as the source of hope and salvation.