A word from Pope Pius IX

You must fight energetically, since you know very well what great wounds the undefiled Spouse of Christ Jesus has suffered, and how vigorous is the destructive attack of Her enemies. You must also care for and defend the Catholic faith with Episcopal strength and see that the flock entrusted to you stands to the end firm and unmoved in the faith. For unless one preserves the faith entire and uninjured, he will without doubt perish forever.

Pope Pius IX for his encyclical,QUI PLURIBUS