“He put a new song in my mouth, a song of praise to our God. Many will see and fear, and put their trust in the LORD” (Psalm 40:3, ESV). David details the deliverance for which he waited patiently (v.1), and which God brought in a complete rescue and restoration to security (v.2). This third verse describes the effect of God’s rescue upon David’s heart, and upon those who will behold what God has done; the wonders of God’s love restore joy to the soul, and testify to the greatness of God.
However rocky the road may be, the destination for God’s people is joy. God’s salvation, the wonderful working of His power and love, brings songs of worshipful delight, and declares that He alone is the source of salvation. Wait upon Him, trust Him, and He will lift you up.