'You will receive power when the Holy Spirit comes on you' (Acts 1.8). Our power from God is through the baptism of the Holy Spirit, and then through our relationship with God in prayer following that experience. The clear promise is that HIS power would be in US. Also that we would become witnesses. A witness is one who sees something and reports on it. We need to see, experience and witness God's miraculous power in action! Not merely by sitting and waiting, but by making it happen through the power of God. To me, it seems that the older I become the more powerful God is, yet it is not God who changes, but me, He reveals more of His glory as I seek after Him.