It is necessary for all the people of the world because salvation and eternal life comes through Christ alone.
It is necessary for us because a living faith in Christ must be shared, by words and by deeds.
Today’s first reading (Acts 18:23-28) gives us examples of sharing faith publically and also sharing faith privately.
Sharing faith does not always require public debates or shouting on street corners.
Sharing faith happens also through deeds of charity and simple words of faithfulness – although explicit references to Christ and the substantive details of our faith can never be totally absent.
We must be prudent, we must be loving, and we must be faithful.