To describe someone or something as rock solid implies firm, sound, dependable, trustworthy and reliable. In the Old Testament God is described as “the Rock of Israel (Gen 49:24),” and an “eternal Rock” (Is 26:4). God is “the righteous and faithful rock” (Deut 32:4) and “our rock, in whom there is no wrong"(Ps 92: 16). Jesus describes himself as a rock. He is “the stone the builders rejected” that is now the “cornerstone” (Matt 21: 42) on which our faith is built. When Jesus pronounces that Simon is now Peter, petros which means rock, he gives Peter the greatest of compliments.
Peter clearly was not the smartest disciple. His erratic behavior got him in lots of trouble with Jesus and probably everyone else. However, Peter had tremendous faith. His declaration that Jesus is “the Christ, the Son of the living God” catapulted him into a leadership position he did not seek. This “confession of faith” made Peter the first and founding member of the church that he and the other disciples would build. Peter’s faith earned him the trust and confidence of Jesus. Recognizing Peter’s special strengths, Jesus followed his own advice and “built his house on rock” (Matt. 7: 24).
St. Peter, himself, tells us that Jesus’ house is built with more than one stone. The church is built of living stones, “chosen and precious in the sight of God” (1 Peter 2: 4). We are the living stones “built into a spiritual house to be a holy priesthood to offer spiritual sacrifices acceptable to God through Jesus Christ” (1 Peter 2: 5). In his Letter to the Ephesians St. Paul reminds us that Jesus is the cornerstone of the household of God and “through him the whole structure is held together and grows into a temple sacred in the Lord; in him you also are being built together into a dwelling place of God in the Spirit” (Ephesians 2: 21 – 22).
God, well-spring of all wisdom,
and source of every insight,
you inspired Simon Peter to confess
that Jesus is the Messiah, the Son of the living God.
On this rock of faith, you have built your church.
Pour out your Spirit in abundance,
that all may join in this profession,
and become living stones
standing firm upon the one foundation,
which is our Lord Jesus Christ, your Son,
who lives and reigns with you
in the unity of the Holy Spirit,
God for ever and ever.
AMEN



