Jesus promised to his followers before he ascended they would soon be baptized by the Holy Spirit. Without the Spirit they would not have the power to accomplish the purpose Jesus had, not just for them, but for all of His disciples. All disciples are commissioned by Jesus as witnesses of him. Witnesses (of Jesus) simply testify about what they have seen and heard about Jesus. Without the Holy Spirit Jesus said we can’t be effective witnesses. So how can we rely on the Spirit of Jesus?