16:18
`` I am ready . '' `` I suppose that we may as well take the first text in the concordance , '' said Robert . `` It is Matt . 16:18 . '' '' ` And I say also unto thee , that thou art Peter , and upon this rock I will build my church ; and the gates of hell shall not prevail against it , ' '' read Mary . `` I have heard a few discussions about the ` rock ' of this text , '' said Robert . `` Some affirm that it means Peter , others that it means Peter 's confession , and still others that it means Christ .