The verse and response lines are taken from Psalm 104  describing God's sending forth His Spirit as He creates all that is seen and unseen, as we pray in the Nicene Creed.   When you're on fire about something, aren't you passionate about it? We are called to be that way in expressing our love for God's truth in how we live and spread our Faith.   It is not always easy finding the right words to pray. On certain days we may be feeling particularly uninspired and no words come to mind to express