Since, like all the faithful, lay Christians are entrusted by God with the apostolate by virtue of their Baptism and Confirmation, they have the right and duty, individually or grouped in associations, to work so that the divine message of salvation may be known and accpeted by all men throughout the earth.  this duty is the more pressing when it is only through them that men can hear the Gospel and know Christ.  their activity in ecclesial communities is so necessary that, for the most part, the apostolate of the pastors cannot be fully effective without it.

Lay people also fulfil their prophetic mission by evangelization, ‘that is, the proclamation of Christ by word and the testimony of life.’ For lay people, ‘this evangelization ... acquires a specific property and peculiar efficacy because it is accomplished in the ordinary circumstances of the world.

‘This witness of life, however, is not the sole element in the apostolate; the true apostle is on the lookout for occasions of announcing Christ by word, either to unbelievers ... or to the faithful.’