Grumbling and Disputing

Whining and complaining seem to be a favorite past time of the world that we live in today. In our text in Philippians 2 Paul commands those who know Christ to "Do all things without grumbling and disputing" Why shouldn't the Christian complain? What does God think of those who complain? Has complaining become a respectable sin? Never have we seen such a society that has so much and yet complain. Dissatisfied and discontent are the hallmarks of a person who complains. When we get to the heart of complaining what really is it? Why do we complain? and how are we to "Do all things without grumbling and disputing"?