22 Deserving of special honor and commendation in the Church are those lay people, single or married, who devote themselves with professional experience, either permanently or temporarily, to the service of associations and their activities. There is a source of great joy for the Church in the fact that there is a daily increase in the number of lay persons who offer their personal service to apostolic associations and activities, either within the limits of their own nation or in the international field or especially in Catholic mission communities and in regions where the Church has only recently been implanted. The pastors of the Church should gladly and gratefully welcome these lay persons and make sure that the demands of justice, equity, and charity relative to their status be satisfied to the fullest extent, particularly as regards proper support for them and their families. They should also take care to provide for these lay people the necessary formation, spiritual consolation, and incentive.
Source: Apostolicam Actuositatem (Vatican.va)