This sermon describes a healthy church as one that possesses sound theology, which is described as a correct and heartfelt understanding of God based on Scripture. Both intellectual accuracy and intimate devotion should be the aim of a healthy church. The speaker outlines key attributes of God, such as His holiness, love, sovereignty, and faithfulness, arguing that a distorted view of these characteristics leads to an unhealthy faith. It is asserted that the church must be united in essential doctrines while maintaining a deep, awe-filled relationship with God that transforms daily life. The message concludes by urging believers to live in a manner worthy of the gospel, demonstrating their theology through faithful conduct and devotion.