What does Psalm 41:12 mean?

David believes the Lord has upheld him because of his integrity. This does not mean he was morally perfect (Psalm 41:4). He did not hide his sin or his grievances from the Lord. He sincerely confessed his errors and told the Lord all about his troubles (Psalm 41:5–10). This psalm began with David's confidence that those who demonstrate godly lives can anticipate God's protection and blessing. While not an absolute promise, David saw a connection between his earlier devotion to God and the Lord's work in preserving David's kingdom. Because of this humility and faith, he was certain the Lord would restore his health and allow him to overcome his foes (Psalm 41:11). David's confidence wasn't in his own goodness as a pre-payment that meant God owed him victory.

It is essential that the believer be honest with the Lord. When he prays, he should approach God's throne with confidence (Hebrews 4:14–16; 10:19–23). Rather than obsessing over troubles, the believer should "not be anxious about anything, but in everything by prayer and supplication with thanksgiving let [his] requests be made known to God" (Philippians 4:6). This is how David prayed, and subsequently peace and confidence filled his heart. Philippians 4:7 assures believers that God's peace, "which surpasses all understanding," will direct their thoughts and attitudes in a Christ-like way if they pray as verse 6 directs.