What does it mean that the law of the Lord is perfect, converting the soul (Psalm 19:7)?

Psalm 19, written by King David, testifies to God’s perfect revelation of Himself to humankind. His revelation occurs in two ways: through the natural world He created (Psalm 19:1–6) and through His written Word (Psalm 19:7–14). Midway through the psalm, David begins to speak of the Scriptures, the avenue through which God clearly reveals His glory to humans. He begins,


As in Psalm 119:1, the “law of the Lord” here in Psalm 19:7 encompasses the totality of God’s Word—the entire divine revelation of truth, teachings, and instructions in Scripture meant to shape faith, character, and conduct. David declares God’s Word to be “perfect,” a term that, in Hebrew, conveys completeness, integrity, sufficiency, blamelessness, and a lack of nothing.

The Word of God is perfect because it is precisely suited to accomplish human salvation and sanctification (1 Thessalonians 2:13). The apostle Paul testified of this to Timothy, “You have been taught the holy Scriptures from childhood, and they have given you the wisdom to receive the salvation that comes by trusting in Christ Jesus. All Scripture is inspired by God and is useful for teaching us what is true and for making us realize what is wrong in our lives. It corrects us when we are wrong and teaches us to do what is right. God uses it to prepare and equip his people to do every good work” (2 Timothy 3:15–17, NLT).

The law of the Lord is “holy, righteous and good” (Romans 7:12), perfectly free from all corruption. It is wholly able to accomplish its designated purpose (Isaiah 55:10–11). It flawlessly equips God’s people for service (2 Timothy 3:17). Nothing must be added to God’s Word or subtracted from it (Deuteronomy 4:2; Revelation 22:18–19).

The phrase converting the soul in Psalm 19:7 points to the complete restoration, reorientation, and transformation of the human soul. David used the same term in Psalm 23, when he stated, “He restores my soul” (Psalm 23:3). God’s Word restores, revives, and refreshes believers from death to life (Psalm 107:20; 119:25, 50; 1 Peter 1:23). It converts the soul by bringing to light our sinfulness and desperate need for God (Romans 3:20, 7:7). It redirects us onto the path of righteousness (Psalm 119:105) and transforms us from the inside-out (Romans 12:2; Hebrews 4:12).

The law of the Lord—the totality of God’s Word—is where we go to find mental, emotional, and spiritual restoration. However, the Word does not accomplish this converting of the soul in isolation. While preaching on Psalm 19:7, Charles Spurgeon explained, “Our text truly says that the Word of God turns us round. It does not mean that the Word alone does that apart from the Spirit of God, because a man may read the Bible through fifty times, and, for fifty years, hear sermons that have all come out of the Bible, and yet they will never turn him unless the Spirit of God makes use of the Word of God or the preacher’s sermons. But when the Spirit of God goes with the Word, then the Word becomes the instrument of the conversion of the souls of men” (“Revelation and Conversion,” in The Metropolitan Tabernacle Pulpit Sermons, vol. 50, Passmore & Alabaster, 1904, p. 74).

God’s Spirit must accompany God’s Word for it to bring life and transformation to the human soul (John 16:13–14; Acts 10:44; 1 Thessalonians 1:5; 1 Corinthians 2:4–5, 10-14). Jesus said, “The Spirit gives life; the flesh counts for nothing. The words I have spoken to you—they are full of the Spirit and life” (John 6:63).

The ultimate revelation of God to humanity is through the person of His Son, Jesus Christ, who is “the radiance of God’s glory and the exact representation of his being, sustaining all things by his powerful word” (Hebrews 1:1-3). Jesus is the Living Word of God (John 1:1–14). He is the perfect, sinless, spotless Lamb of God (Hebrews 4:15; 2 Corinthians 5:21; 1 Peter 1:19; 2:22). Christ, who is the only way of salvation (John 3:16, 14:6; Acts 4:12), came to fulfill the Law (Matthew 5:17–18; Romans 10:4). Through faith in Him and His work of redemption on the cross, we experience the converting of our souls—restoration, sanctification, and the gift of eternal life with God forever (Romans 8:3–4; Galatians 3:24–25; 4:4–5; Colossians 2:13–14; Ephesians 2:8–9).