What was the point of the wind, fire and tongues at Pentecost?–Acts 2:1-4

Signs at Pentecost (2:1-4). 5 minutes by Acts scholar Craig Keener. For 23 free lectures on Acts, see http://faculty.gordon.edu/hu/bi/ted_hildebrandt/DigitalCourses/00_DigitalBiblicalStudiesCourses.html#Acts_Keener

Bible Background