No one has the right to say with Cain: "Am I my brother's keeper?" [Gen 4:9] No one is a Christian for himself alone. - Henri de Lubac

It is […] the very opposite of a "closed society". Like its founder it is eternal and sure of itself, and the very intransigence in matters of principle which prevents its ever being ensnared by transitory things secures for it a flexibility of infinite comprehensiveness, the very opposite of the harsh exclusiveness which characterizes the sectarian spirit.[…] The Church is at home everywhere, and everyone should be able to feel himself at home in the Church. Thus the risen Christ, when he shows himself to his friends, takes on the countenance of all races and each hears him in his own tongue.

[T]hough not being absolutely the same as ours, the difficulties for a Saint Peter or a Saint Paul in believing were no less strong. Nor were those of their successors, the Origens and the Cyrils , the Ambroses and the Augustines. Modern man flatters himself when he judges that the Copernican revolution or the Kantian revolution dug out a new hiatus between his thought and the thought of the Ancients. It was as hard to believe then as it is today! It was hard, for a Jewish monotheist—"Listen, Israel! Your God is one!"—to believe in the divinity of a man. It was hard to believe in the crucifixion of the Son of God. It was hard for a reasonable man, who had been able to see up close the Son of Man in his humiliation, to believe in the resurrected Christ.

To seek sincerity above all things is perhaps, at bottom, not to want to be transformed; it is to cling to yourself, to have a morbid love of yourself, just as you are, that is to say, false. It is to refuse release.