One nobility belongs to all the faithful, one dignity, one splendour of race, since all are born of the same Spirit and of the same sacrament of faith, and are sons of God and coheirs of the same inheritance; the rich and the powerful have no other Christ besides Him Who is followed by the poor; they are initiated in no other sacraments, and have no higher expectation of the Celestial Kingdom; all are brethren and members of the Body of Christ, of His flesh and of His bones.
The Catechism of Trent, as quoted by Kenelm Henry Digby in The Broad-Stone of Honour
The true Catholic principle regarding the life of man, is of course Vocation; the fulfillment of the unique purpose and mission in accordance with God’s will. It is intrinsically bound up with the final end of Man, the call to holiness and virtue. It is this principle which must be the foundation of any Catholic Nobility. However, since it is true that not only does all of Mankind share in an inherent nobility (disgraced but not debased by the Fall), but also that all of the Faithful share in a Nobility of Royal Priesthood, wherein does the concept of a separate hierarchical Nobility find its justification?