David Wilkerson emphasizes the importance of expressing gratitude and thanksgiving to God during times of testing and trials, arguing that true faith is demonstrated by praising God even before the victory is realized. He reflects on the Israelites' experience at the Red Sea, noting that their praise came after the deliverance rather than during their struggle, which missed the opportunity to strengthen their faith. Wilkerson encourages believers to offer a 'sacrifice of thanksgiving' in the midst of difficulties, suggesting that this attitude can lead to spiritual breakthroughs and blessings. He cites James 1:2 to reinforce the idea that joy in trials is a key to overcoming challenges. Ultimately, he calls for a shift in perspective, urging believers to sing the right song while still in the battle, as this pleases God.