Here the writer speaks of knowing and worshiping God as being more satisfying than eating a good meal. AT: "I will be happier than a person who eats a meal of fat and choice food" (See: [[rc://en/ta/man/translate/figs-simile]])
Here "with joyful lips my mouth" represents the whole person who will praise God joyfully. AT: "I will praise you joyfully" (See: [[rc://en/ta/man/translate/figs-synecdoche]])