Consecrated Religious Life:
Second & third (Secular) orders
"And after these things the Lord appointed also other seventy-two: and he sent them two and two before his face into every city and place whither he himself was to come. And he said to them: The harvest indeed is great, but the labourers are few. Pray ye therefore the Lord of the harvest, that he send labourers into his harvest. Go: Behold I send you as lambs among wolves. Carry neither purse, nor scrip, nor shoes; and salute no man by the way. Into whatsoever house you enter, first say: Peace be to this house."
~Luke 10: 1-5
"In virtue of their rebirth in Christ there exists among all the Christian faithful a true equality with regard to dignity and the activity whereby all cooperate in the building up of the Body of Christ in accord with each one's own condition and function."
The very differences which the Lord has willed to put between the members of his body serve its unity and mission. For "in the Church there is diversity of ministry but unity of mission. To the apostles and their successors Christ has entrusted the office of teaching, sanctifying and governing in his name and by his power. But the laity are made to share in the priestly, prophetical, and kingly office of Christ; they have therefore, in the Church and in the world, their own assignment in the mission of the whole People of God." Finally, "from both groups [hierarchy and laity] there exist Christian faithful who are consecrated to God in their own special manner and serve the salvific mission of the Church through the profession of the evangelical counsels."