§1. Since, like all the Christian faithful, lay persons are designated by God for the apostolate through baptism and confirmation, they are bound by the general obligation and possess the right as individuals, or joined in associations, to work so that the divine message of salvation is made known and accepted by all persons everywhere in the world. This obligation is even more compelling in those circumstances in which only through them can people hear the gospel and know Christ.
§2. According to each one’s own condition, they are also bound by a particular duty to imbue and perfect the order of temporal affairs with the spirit of the gospel and thus to give witness to Christ, especially in carrying out these same affairs and in exercising secular functions.
Source: Code of Canon Law (Vatican.va)