This Sunday is PENTECOST, celebrating the coming of the Holy Spirit to be among us and within us. 
When the Holy Spirit came on the day of Pentecost, why did the believers break out into ecstatic language? Simply, it was because they were rightly worshiping God for the first time. Intensive worship unexpectedly leaped out of their hearts. It was nothing planned or perpetuated by some 'worship leader.' God was in their midst. Whenever there is a move of the Holy Spirit, it is always a call for God's people to be worshipers of the Most High God above everything else.

-- A. W. Tozer