“When a lull came in the conversation he sat up in bed with vigor and said: "Does not all this explain that mysterious passage in the Gospel which tells how Mary placed her 'firstborn' in the manger? So many have mistakenly believed that that word implies that she was to have other children. We know she was to have millions on millions but not according to the flesh; only in the spirit. Jesus was her only Son in one sense, but all men are her children in the other." "Exactly," said the young scholar. "In one of his encyclicals, Pius X told how Mary, carrying Jesus in her womb, was carrying each of us spiritually; for in carrying the Head of the Mystical Body physically, she was carrying the whole Mystical Body spiritually." (Chapter 2)”
Book:Your Hour