"Numerous are the waves, and great the tossing of the sea, but we have no fear of going down, for we stand upon the rock. Let the ocean rage as it will, it is powerless to break the rock. Let the waves roll, they cannot sink the bark of Jesus. ...THERE IS NOTHING MORE POWERFUL THAN THE CHURCH, man; give up fighting her, lest she overpower your strength. Wage not war against heaven. ... if you fight the Church, you cannot conquer. For God is stronger than all.
WHO WILL VENTURE TO SUBVERT THE ORDER WHICH GOD HAS ESTABLISHED? You know not His power. ... The Church is stronger than heaven. 'Heaven and earth shall pass away, but My words shall not pass away.' What words? 'Thou art Peter, and upon this rock I will build My Church, and the gates of hell shall not prevail against it."
"Built Upon The Rock" (Homily by St. John Chrysostom before by Providence he went into exile, tom, iii., p. 415)