Isaiah 58:1 Shout it aloud, do not hold back. Raise your voice like a trumpet. Declare to my people their rebellion and to the descendants of Jacob their sins.
Jesus did not teach people to simply talk about God but to reach out to people and allow God to move in their lives.
God wants us to bring people closer to Christ so they will understand, themselves, how important it is to know Christ.
This is what it is to make disciples, not Christians. We need to get people to come and join in what God wants, not to just sit and listen!
So, shout all about it; but also encourage people to get down and do stuff with Christ themselves!