In Psalm 33, the psalmist praises God for his Word, his creation and his sovereignty. This time of praise helped the psalmist put life in perspective and reminded him to wait for the Lord, his shield.
Sometimes we lack the strength or courage to face difficult situations in our lives, as the psalmist did. In times like these, the best way to remind ourselves that God is our protection today is to remember what he did for us in the past. This gives us a whole new perspective on what we’re facing and reminds us that God is our shield to protect us and give us hope. See also Ephesians 6:10–18.