T. Austin-Sparks emphasizes the peril of self-interest in his sermon 'The Voice of Jeremiah (Continued) IV', drawing from the experiences of Baruch and Jeremiah. He highlights how Baruch's loyalty to Jeremiah, despite immense personal cost, serves as a contrast to the self-seeking attitudes prevalent among the people of Israel and even the disciples of Jesus. The preacher warns against the dangers of seeking greatness for oneself, urging that true fulfillment comes from making Christ the center of our ambitions. He illustrates that while self-interest leads to loss, surrendering to God results in eternal gain. Ultimately, the sermon calls for a deep work of the Cross to eradicate selfhood and align our desires with God's purpose.