Witnesses of Christ

Luke 24: 35-48
Acts 3: 11-26 / Psa 8
… repentance and forgiveness of sins should be preached in His name to all nations, beginning from Jerusalem. You are witnesses of these things.
(Luke 24: 48)
What kind of witnesses are we?
Why are we troubled and in doubt?
Let Jesus in and we shall see
All our weaknesses and fears fly [...]