11 The Church must be present in these groups through her children, who dwell among them or who are sent to them. For all Christians, wherever they live, are bound to show forth, by the example of their lives and by the witness of the word, that new man put on at baptism and that power of the Holy Spirit by which they have been strengthened at Conformation. Thus other men, observing their good works, can glorify the Father (cf. Matt. ES:16) and can perceive more fully the real meaning of human life and the universal bond of the community of mankind. In order that they may be able to bear more fruitful witness to Christ, let them be joined to those men by esteem and love; let them acknowledge themselves to be members of the group of men among whom they live; let them share in cultural and social life by the various. undertakings and enterprises of human living; let them be familiar with their national and religious traditions; let them gladly and reverently lay bare the seeds of the Word which lie hidden among their fellows. At the same time, however, let them look to the: profound changes which are taking place among nations, and let them exert themselves to keep modern man, intent as he is on the science and technology of today's world from becoming a stranger to things divine; rather, let them awaken in him a yearning for that truth and:charity which God has revealed. Even as Christ Himself searched the hearts of men, and led them to divine light, so also His disciples, profoundly penetrated by the Spirit of Christ, should show the people among whom they live, and should converse with them, that they themselves may learn by sincere and patient dialogue what treasures a generous God has distributed among the nations of the earth. But at the same time, let them try to furbish these treasures, set them free, and bring them under the dominion of God their Savior.
Source: Ad Gentes (Vatican.va)