Christmas was the beginning of "one world". Like His heavenly Father, Jesus, would have a chosen race-all mankind in the Catholic Church. The Church, to all appearances a mere organization, is really an organism-The Mystical Body of Christ, a Body living and breathing the life of God by grace. The cells of this Body are men, and it is meant to grow to "The fullness of Christ." That is why Jesus, the Head of the Mystical Body, did not come to earth full grown out of the clouds, but was born a Child.From Fr. Patrick Peyton's Rosary Prayer Book.
Purity of mind and body is a personal precept and a social virtue. But it is much more. It is a bulwark of the Kingdom of God on earth.