"For those, however, who have not received the Gospel proclamation, as I
wrote in the Encyclical Redemptoris Missio, salvation is accessible in
mysterious ways, inasmuch as divine grace is granted to them by virtue of
Christ's redeeming sacrifice, without external membership in the Church, but
nonetheless always in relation to her (cf. RM 10). It is a mysterious
relationship. It is mysterious for those who receive the grace, because they do
not know the Church and sometimes even outwardly reject her."
John Paul II, General Audience, 31 May 1995