In the fourth episode of "Murmuring and Complaining," Duane Sheriff teaches the dangers of murmuring and complaining, contrasting them with the importance of thanksgiving and glorifying God. Murmuring and complaining are voices of unbelief, while praise and gratitude are voices of faith.

Romans 1:18-21 reveals how a lack of gratitude and an unthankful heart can lead believers away from their faith, causing their hearts to be filled with foolishness and darkness. 

In 2 Timothy 3:1-5, Duane emphasizes that unthankfulness is a significant characteristic of people in the last days, among other negative traits. He emphasizes the importance of cultivating a heart of gratitude. To grow in the knowledge and will of God, one must give thanks in all circumstances, as stated in 1 Thessalonians 5:18.

Duane shares personal stories and scriptural insights to inspire believers to stop complaining and instead adopt an attitude of gratitude. He believes that being thankful can profoundly change a person's life and bring them closer to God's plan. He promises that doing so will help deepen their relationship with God and help them experience His presence and blessings more fully.