What does Psalm 29:11 mean?

David concludes Psalm 29 with a benediction. He asks the Lord, the eternal King, to give His people strength. David has already alluded to the Lord's strength in His display of control of nature (Psalm 29:3–10). Now David asks the Lord to impart strength to His people. In this context, that "strength" is mostly about perseverance: the ability to maintain faith in God, trusting His power rather than our own (Hebrews 10:23).

Isaiah 40 promises strength to the Lord's weary people. Isaiah 40:30–31 promises: "Even youths shall faint and be weary, and young men shall fall exhausted; but they who wait for the LORD shall renew their strength; they shall mount up with wings like eagles; they shall run and not be weary; they shall walk and not faint." However, the Lord is not just the source of power for His people, but also the source of peace. David asks the Lord to "bless his people with peace." The world cannot capture peace. Political peace treaties rarely last long and new threats are constantly emerging, health deteriorates, accidents happen, relationships are broken, economies crumble; there seem to be no end of reasons a person could be anxious. But those who love the Word of God and the God of the Word have great peace (Psalm 119:65; Isaiah 26:3; John 14:27). Our hope is not in this world or the things of this world, but in the very God who created the world and who adopts all who put their faith in Jesus Christ as His own (Galatians 4:4–7; John 1:12). We will still experience hardship, but we have God's promise of peace in the midst (John 16:33; James 1:2–4; 1 Peter 1:3–9; 5:7), and we know we will one day be with Him forever.