Grumbling, Disputing, and Running in Vain_ Philippians 2:14-16

What is the connection between God working in us both to will and to do according to His own good pleasure and the elimination of grumbling and disputing from our lives? Why does Paul see this as so important that he sees the logical implication of habitual grumbling and disputing as evidence that all his labor in the Gospel would be in vain? Walk with Pastor Matt through Philippians 2:14-16 to see how this text is related to ‘The Song of Moses,’ and the the disturbing implications for the discontented ‘believer.’