T.P. Haley preaches about the importance of building the Church of Christ on the foundation of Jesus Christ. He addresses the divisions in the Church of Corinth and emphasizes the need for unity in faith and judgment. Haley highlights that the Church is God's building, with Jesus Christ as the singular foundation. He contrasts the foundation of the Church with other beliefs, showing that it is built on the truth that Jesus is the Christ, the Son of the living God. Haley stresses the significance of preaching Christ crucified as the foundation of the Church and the necessity for believers to hear, believe, and be immersed in the name of the Father, Son, and Holy Spirit.

T.P. Haley delivers a sermon reflecting on the unity amidst diversity within the Disciples of Christ movement, tracing back to the teachings and reforms initiated by Father Thomas Campbell and his son Alexander. Despite differing theological views and practices, the movement emphasized unity in essentials, liberty in non-essentials, and charity in all things. The sermon highlights the evolution of beliefs, such as the rejection of human creeds, the emphasis on the Bible as the sole rule of faith, and the acceptance of believers through confession of faith in Christ. It also explores the journey towards unity in doctrine and practice, despite initial disagreements on baptism, church government, and missionary work.