K.P. Yohannan emphasizes the transformative power of humility in his sermon 'Peace Through Humility.' He illustrates how true Christlike humility is tested when we are asked to submit to others, even those younger or less experienced than us. Through the story of a brother who overcame pride and embraced a new role, Yohannan highlights that humility is essential for spiritual growth and peace. He contrasts the pride of Lucifer, which led to his downfall, with the humility of Christ, who exemplified obedience and selflessness. Ultimately, the sermon encourages believers to seek opportunities for humility to experience true peace and rest in their souls.