Mystici Corporis Christi §21

²¹ In this connection it must be borne in mind that, as God at the beginning of time endowed man's body with most ample power to subject all creatures to himself, and to increase and multiply and fill the earth, so at the beginning of the Christian era, He supplied the Church with the means necessary to overcome the countless dangers and to fill not only the whole world but the realms of heaven as well.