Bro Eli revealed the Mark 16:9 is not the Bible but it was added by some folks.
Our God Is a great God and that why the gospel in been preached through the internet, television, radio, satellite and other means of reaching people. If are to be speaking to people individually it will take time and we won't be able to reach out to more people. Also, we are to proclaim the gospel of our Lord Jesus in the public and not in the corner because our God is not a God is to be hidden.
The Acts 26:26 For the king knoweth of these things, before whom also I speak freely: for I am persuaded that none of these things are hidden from him; for this thing was not done in a corner.