This sermon confronts the pervasive and destructive nature of complaint, framing it not merely as just dissatisfaction but as a spiritual symptom of untrusting and unsubmitted hearts, rooted in the human tendency to focus on lack rather than divine provision. Drawing from the story of Israel's murmuring in Numbers 11, it illustrates how complaint—especially against God's blessings like manna—leads to divine judgment, because of a hardened, self-isolating spirit that separates individuals from God and His people. The message identifies three devastating outcomes: complaint breeds resistance to God's authority, causes ruin by destroying unity through exaggeration and victim mentality, and results in regret by damaging Christian testimony and hindering witness. Ultimately, the remedy is not self-effort but intentional praise, which dissolves discontent and reorients the heart toward God's goodness, as exemplified in the repeated call of Psalm 107 to glorify God for His enduring faithfulness.