The central message of this sermon is that God's power and tenderness are not mutually exclusive, but rather complementary aspects of His character. The speaker argues that Isaiah 40 presents a unique opportunity to encounter God as He truly is, with all His eternal power and divine nature, rather than reducing Him to a manageable or less threatening level. This message advances the belief that God is not just a distant, judgmental figure, but also a loving and caring one who is intimately involved in the lives of His people. The speaker wants listeners to understand that this understanding of God is not limited to biblical revelation, but can be discerned through natural theology, or observing the world around us and recognizing the invisible attributes of God, such as His eternal power and divine nature.