Acts 1:8 But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth."

What do witnesses do? Faithful witnesses tell what they know about something. They are not required to be experts. They simply describe what they saw, heard, or experienced. As Christians we are witnesses that Jesus has risen from the dead. We are witnesses that He has saved us from sin. Our main business is to tell others. Our holy lives and good deeds are two ways we witness.   

Imagine a man who is a silent witness in court. The witness is called to the front of the room. The lawyer asks the witness if he has seen something. The witness nods his head and smiles. Then the lawyer asks the witness to tell what he knows. The witness just smiles and remains silent. Each time the lawyer asks a question, the witness only smiles. This would be foolish. A witness who does not tell what he or she knows is no witness at all. To witness for Jesus, we must speak the right words for Him at the right times. Believers should never be afraid to witness for Jesus.