Who is this Holy Spirit? 

The restless power of God.

The giver of freedom. Not merely from bondage or enclosure, but freedom to run!

The disciples did not know what to expect as they awaited the Holy Spirit. That’s the open-ended approach Jesus prescribed. As they waited for the Baptism of the Holy Spirit, they could not pre-determine the outcome of the waiting. The waiting was their business, the outcome, by the Spirit, was up to Him.

And so it remains, even for us. Do not presume rushing wind, tongues of fire or tongues of man. Rather, wait. 

Our weakness is our presumption, and our unwillingness to tarry… long, if it pleases Him. For this is how the Spirit comes: In His power; in His time.