The Lord said, "And I also say to you that you are Peter (petros, a stone, a piece of rock), and on this rock (petra, a mass of rock) I will build My church, and the gates of Hades shall not prevail against it." Jesus employs a different word for "Peter" and "rock" and so it is possible that "this rock" refers to something other than Peter.
Itinuturo ng Vatican na si Pedro ang ‘pinakamataas na pastol (shepherd) ng Iglesiya)’ (Katekismo saknong 857), nguni’t ito rin ay sasalungatin ni Pedro dahil sa tinawag niya si Jesu Cristo na ‘Pangulong Pastol’ (Chief Shepherd) (1 Peter 5:4).