Those who grumble and complain about the circumstances of their lives are manifesting a spirit of pride.  A person who complains about his circumstances does so because he thinks he deserves better. 
A humble person, on the other hand, willingly accepts whatever God ordains.  He says with Paul, “I have learned to be content in whatever circumstances I am” (Phil. 4:11).
– Wayne A. Mack (with Joshua Mack) in Humility