33 The most holy council, then, earnestly entreats all the laity in the Lord to answer gladly, nobly, and promptly the more urgent invitation of Christ in this hour and the impulse of the Holy Spirit. Younger persons should feel that this call has been directed to them especially and they should respond to it eagerly and generously. Through this holy synod, the Lord renews His invitation to all the laity to come closer to Him every day, recognizing that what is His is also their own (Phil. 2:5), to associate themselves with Him in His saving mission. Once again He sends them into every town and place where He will come (cf. Luke 10:1) so that they may show that they are co-workers in the various forms and modes of the one apostolate of the Church, which must be constantly adapted to the new needs of our times. Ever productive as they should be in the work of the Lord, they know that their labor in Him is not in vain (cf. 1 Cor. 15:58).
Source: Apostolicam Actuositatem (Vatican.va)