11 Do not withhold Your tender mercies from me, O Lord; Let Your lovingkindness and Your truth continually preserve me. 12 For innumerable evils have surrounded me; My iniquities have overtaken me, so that I am not able to look up; They are more than the hairs of my head; Therefore my heart fails me. (Psalm 40:11–12, NKJV)
While pleading for God’s mercy to abide with him, David acknowledged God’s merciful protection comes from His steadfast love and truth. When evil surrounds us and our own sins overwhelm us, God’s mercy secures our souls. He supplies abundant mercy when sinful forces from without and within test our hearts and try our faith. God’s mercy flows from His eternal love. His every purpose and act is founded in His abiding love for us (John 3:16; 1 John 4:7-10). Simultaneously, it is His truth that safely protects us against evil and its forces. His word (which is truth, John 17:17) explains how mercy and truth meet to give us relief from our sins (Psalm 85:10). We do not mandate the mercy of God; His word of truth does that. It explains how and upon whom the Lord shows mercy (Romans 9:14-18). Truth teaches us that we cannot expect to receive God’s mercy if we are practicing sin. Sin brings wrath (Romans 1:18). Mercy comes when we repent and obey God’s truth (Ephesians 2:4-10; Hebrews 5:8-9; Titus 3:4-5). God’s mercy proceeds from love and is revealed by truth. All who put their trust in Him and do His will shall be preserved by His mercy (Psalm 40:1-8).