T. Austin-Sparks emphasizes the profound significance of hearing the voice of the Son of God, as illustrated through the story of Lazarus. He explains that true spiritual hearing transcends mere physical ability and is a sovereign act of God that brings about a living relationship with Christ. The sermon highlights that only those who are spiritually 'dead' can truly hear this voice, leading to a transformative faith that redefines existence and purpose. Sparks warns against superficial Christianity, urging believers to seek a deeper, experiential knowledge of Christ that is rooted in divine revelation rather than human persuasion. Ultimately, he calls for a recognition of the eternal implications of hearing God's voice, which brings life and hope even in the face of despair.

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.