from Desiring God president, and author of Not by Sight: A Fresh Look at Old Stories of Walking by Faith, Jon Bloom:
“Grumbling is a symptom of a myopic soul. Selfishness has caused tunnel vision and has fixated on a craving(s). Grumbling is evidence of soul-vision impairment. Gratitude is a symptom of a healthy, expansive soul. The gospel of grace has given it panoramic vision, allowing it to see that this grace will be sufficient (2 Corinthians 12:9) to meet every need (Philippians 4:19).