The lay organisation within the Church
940 "The characteristic of the lay state being a life led in the midst of the world and of secular affairs, lay people are called by God to make of their apostolate, through the vigour of their Christian spirit, a leaven in the world" (AA 2 # 2).
941 Lay people share in Christ's priesthood: ever more united with him, they exhibit the grace of Baptism and Confirmation in all dimensions of their personal family, social and ecclesial lives, and so fulfil the call to holiness addressed to all the baptized.
942 By virtue of their prophetic mission, lay people "are called . . . to be witnesses to Christ in all circumstances and at the very heart of the community of mankind" (GS 43 # 4).
943 By virtue of their kingly mission, lay people have the power to uproot the rule of sin within themselves and in the world, by their self-denial and holiness of life (cf. LG 36).
2442 It is not the role of the Pastors of the Church to intervene directly in the political structuring and organization of social life. This task is part of the vocation of the lay faithful, acting on their own initiative with their fellow citizens. Social action can assume various concrete forms. It should always have the common good in view and be in conformity with the message of the Gospel and the teaching of the Church. It is the role of the laity "to animate temporal realities with Christian commitment, by which they show that they are witnesses and agents of peace and justice."230
The Catechism of the Catholic Church: