Holy Spirit comes on you, you will be able to be my witnesses

Acts 1:6-14
Timing is the Father's business.
When the Holy Spirit comes on you, you will be able to be my witnesses in Jerusalem, all over Judea and Samaria, even to the ends of the world.
Apostles returned to Jerusalem, and they completely together in prayer, 11 apostles and the women, include Jesus' mother, Mary and his brothers.
A cloud: the sign of God's glory and the means of conveying Jesus from them.
Sabbath day's journey: Jewish law limited travel on the Sabbath to 2000 cubits - about 1 km.
We know that James, at least, had seen the risen Jesus.
Why?
They still did not know why Jesus be crucified and returned to present before them. They were hoping the kingdom of Israel, the kingdom on the world.
When we get the Holy Spirit we are able to be Jesus' witnesses in every city and the world.
Waiting for the Holy Spirit is get together and in prayer. When they got Holy Spirit they understood that Jesus is the Lord not a human king, he is the son of the Lord.
Waiting is a hard time to be passed, but Jesus asked us to wait for the Holy Spirit. Facing the difficulty needs to prayer and wait for the God's work.
How?
Waiting for God's time through prayer and get together with other Christians.