"I will pour out in those days of my Spirit; and they shall prophesy" (Acts 2:18)
God dwells in a state of perpetual enthusiasm. He is delighted with all that is good and lovingly concerned about all that is wrong.
He pursues His labors always in a fullness of holy zeal. No wonder the Spirit came at Pentecost as the sound of a rushing mighty wind and sat in tongues of fire on every forehead. In so doing He was acting as one of the Persons of the blessed Godhead.
Whatever else happened at Pentecost, one thing that cannot be missed by the most casual observer was the sudden upsurging of moral enthusiasm.
Those first disciples burned with a steady, inward fire. They were enthusiastic to the point of complete abandon.
With the disciples baptism in the Spirit, their whole demeanor changed. The sadness left their hearts. The minor key left their worship. Their self-imposed righteousness was turned into life in the Spirit.
~A. W. Tozer~