This sermon explores the biblical command to rejoice in the Lord always and to let moderation be known to all, drawing primarily from Philippians 4:4-5. The speaker argues that Christian joy is a deliberate act of the will grounded in the secure character of God rather than fleeting emotions or favorable circumstances. By examining the attributes of the Father, Son, and Holy Spirit, the text highlights how divine love, power, and redemption provide an unshakeable foundation for gratitude even amidst suffering. The message further connects this rejoicing to the virtue of gentleness, urging believers to exhibit meekness in conflicts while trusting in the imminent presence and return of Christ. Ultimately, true and lasting happiness is found exclusively through faith in Christ and the assurance of one's name being written in the Book of Life.