This is holy Church, the one Church, the true Church, the Catholic Church, fighting against all heresies; she can fight, but she cannot be conquered. All heresies are expelled from her as if they were dead branches pruned from the vine; she herself, however, remains fixed in her root, in her vine, in her charity. The gates of hell shall not prevail against her.

St. Augustine of Hippo (354-430AD) on the permanence of the Catholic Church