Charles Finney addresses the sin of fretfulness, emphasizing that fretting over the actions of evil doers not only harms our own spiritual well-being but also dishonors God. He outlines reasons to avoid fretfulness, such as its destructive impact on our peace and influence, and the fact that it adds sin to sin. Finney encourages believers to cultivate a spirit of patience and to trust in God's providence, recognizing that all events serve a greater purpose in His divine plan. He concludes with practical steps to overcome fretfulness, including prayer, self-reflection, and focusing on the good in others.

A.W. Tozer addresses the issue of fretfulness in the Christian life, emphasizing the admonition from Psalms 37:1 to avoid irritation and envy towards those who do wrong. He explains that the term 'fret' encompasses a range of negative emotions that can gnaw at our peace and joy. Tozer highlights that while the grace of God can calm our agitation, the deeper roots of fretfulness may still linger within us, manifesting in various forms. He encourages believers to seek the Holy Spirit's help in identifying and uprooting these hidden sources of distress. Ultimately, Tozer calls for a deeper examination of our hearts to fully experience God's peace.

Thomas Brooks emphasizes that a fretful and muttering spirit under affliction is a greater judgment than the affliction itself, as it mirrors the nature of the devil. He warns that such a spirit is akin to the devil's sin and punishment, highlighting that the devil is perpetually restless and seeks to lead souls astray. Brooks illustrates how Satan tempts individuals with various lures, always seeking to ensnare them in sin, and he urges believers to recognize the danger of a discontented heart. The sermon serves as a reminder that true peace comes from trusting God amidst trials, rather than succumbing to a spirit of fretfulness.