Even if they do not belong visibly to the Church, all those who have grace, among dissident Christians or non-Christians, are also assumed by the person of the Church in her redemptive work. For by the sole fact that they are men come into the world after the sin of Adam the person of the Church is virtually and invisibly present in them; and by the sole fact that they have grace, the person of the Church, without their knowing it themselves, draws them to her and to that which she accomplishes. But then she draws them at the same stroke, without their knowing it, from their Christian-dissident or non-Christian spiritual family, which is not integrated in the person of the Church; and it is as being invisibly and unconsciously a part of the Church entrusted to Peter that they share in the redemptive work accomplished by the person of the Church. Whereas at the same time, to the extent that there is in them personal holiness, they bear testimony to the paths which the spiritual family to which they belong visibly leaves open to the grace of God.
Jacques Maritain (1882–1973)