Inasmuch as the earthly and visible Church is not the fullness and completeness of the whole Church which the Lord has appointed to appear at the final judgment of all creation, she acts and knows only within her own limits; and (according to the words of St. Paul the Apostle, to the Corinthians, I Cor. 5:12) does not judge the rest of mankind, and only looks upon those as excluded, that is to say, not belonging to her, who exclude themselves. The rest of mankind, whether alien from the Church, or united to her by ties which God has not willed to reveal to her, she leaves to the judgment of the great day.
I'm curious about what people think of this quote, specifically the part about people being united to the Church in some unknown way. Is this orthodox belief or no?