Thomas Brooks emphasizes the transient nature of sorrow in the life of a Christian, reminding us that while weeping may endure for a night, joy will surely come in the morning. He illustrates how God transforms our hardships into blessings, turning our grief into gladness and our mourning into music. Brooks argues that a balance of both joy and sorrow is essential for spiritual health, as both mercy and adversity contribute to the growth of our faith. He concludes that the interplay of these experiences is vital for the flourishing of our souls, as trials often lead to the death of sin and the thriving of grace.

"Weeping may endure for a night—but joy comes in the morning." Psalm 30:5 Their mourning shall last but until morning. God will turn . . . their winter's night into a summer's day, their sighing into singing, their grief into gladness, their mourning into music, their bitter into sweet, their wilderness into a paradise. The life of a Christian is filled up with interchanges of sickness and health, weakness and strength, want and wealth, disgrace and honor, crosses and comforts, miseries and mercies, joys and sorrows, mirth and mourning. All honey would harm us; all wormwood would undo us—a composition of both is the best way to keep our souls in a healthy constitution. It is best and most for the health of the soul—that the warm south wind of mercy, and the cold north wind of adversity—do both blow upon it. And though every wind which blows, shall blow good to the saints; yet certainly their sins die most, and their graces thrive best, when they are under the frigid, drying, nipping north wind of calamity, as well as under the warm, nourishing south wind of mercy and prosperity.