Wrong. Jesus is referring to the truth that Peter spoke... that Jesus is the Son of God.... THAT is the cornerstone that the church is built on. Peter was named "little stone" because he spoke about the "big stone" correctly. The church was not built upon Peter. That is pure Roman Catholic doctrine, and is, basically, heresy....And Jesus was referring to Peter as being the first stone that is laid down. and upon this stone many other stones will be resting upon this cornerstone.