"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 a man, you conquer or are conquered. But if you fight the Church, you cannot conquer. For God is stronger than all. ... Are we stronger than He? WHO WILL VENTURE TO SUBVERT THE ORDER WHICH GOD HAS ESTABLISHED? You know not His power. He looks down upon the earth and causes it to tremble. He commands, and that which was shaken becomes firm. ... 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 God's Will) he went into exile, tom, iii., p. 415