Sometimes we look at grumbling or complaining as “little” sins that are not very bad. But God looks at them very seriously. In the old testament times He would sometimes even punish chronic complaining with death:
And do not grumble, as some of them did—and were killed by the destroying angel. (I Corinthians 10:10 NIV)
Grumbling is a very common sin in America. One could almost refer to it as a pastime. Perhaps the worst kind of grumbling is grumbling directly against God; complaining against Him for the little difficulties in our life while forgetting to thank him for the wonderful blessings we each have. But complaining against other people is often wrong too, because it reflects a great dissatisfaction with God.
Sometimes Christians grumble against their BOSS. They talk about him behind his back, and assume the worst motives for every decision he makes, while ignoring all the good decisions he makes, and refusing to recognize the difficulties he is faced in making his decisions. True believers should not be disrespectful to authority. They should be kind to their boss–even the imperfect ones–and make sure that their criticisms are minimal and helpful.
Christians love to grumble against the GOVERNMENT. Indeed, governments make a lot of mistakes since they are controlled by greedy humans. Nevertheless, much of our complaints reveal our own selfishness and arrogance. We need to respect and obey the secular authorities.
Some children choose to grumble against their PARENTS. Whiny children can be some of the least thankful of anyone. They choose to see only faults. They often commit many of the same mistakes they accuse their parents of without remorse. It is better for children to find peace through loving God and rejoicing in their bond with their parents rather than constantly whining about things they do not have.
Instead of complaining all the time, we need to PRAISE GOD for the many good things in our lives. Whenever we are faced with difficulties we need to ask God for help rather than simply blame him for what has happened. God has many spiritual blessings for those who are thankful and dependant on Him. Yes, hard times will come, but one will be so much more content if they approach the hard times with a spirit of supplication rather than a spirit of blame.