G. Campbell Morgan explores 'The Parable of the Mustard Seed,' emphasizing the importance of careful interpretation to avoid popular misconceptions and historical misinterpretations. He argues that the parable illustrates the unnatural growth of the Kingdom of God, which, while starting from humble beginnings, has often developed into something that contradicts its original intent, leading to pride and dominance rather than humility and service. Morgan warns against equating worldly success with the true nature of the Kingdom, asserting that the Church has often strayed from Christ's teachings of lowliness and meekness. He concludes that true greatness in the Kingdom will ultimately be defined by service and humility, contrasting it with the false greatness often pursued by the Church throughout history.