David teaches from Acts 1. If we intend to be what Christ has called us to be, as Christians, there is one thing that is needed most. There are three parts in this passage that will reveal this. Through the intro, the instruction from Christ, and the ascension of Christ, we will see that it is not really what we need, but who we need.
Additional scripture references: John 16; Galatians 2:20; Ephesians 5; Matthew 13; Luke 11.