Jon Bloom recently posted “How to Complain Without Grumbling” on the Desiring God Blog (June 23, 2015). In this helpful post, Bloom explains how to be a “faithful complainer”:
When we complain, it is frequently evil. But complaining is not necessarily evil. There’s a faithful (believing) way to complain and a faithless (unbelieving) way to complain.
The Bible often refers to faithless complaining as grumbling and warns us not to do that (Numbers 14:26–30; John 6:43; Philippians 2:14; James 5:9). Grumbling complaints directly or indirectly declare that God is not sufficiently good, faithful, loving, wise, powerful, or competent. Otherwise, he would treat us better or run the universe more effectively. Faithless complaining is sinful because it accuses God of doing wrong.