A.W. Tozer emphasizes the contrast between the rapidly changing external world and the unchanging nature of humanity's inner self. He reflects on how Jesus lived in a time devoid of modern conveniences and technology, yet the people of that era were just as real and complex as we are today. Tozer argues that while our surroundings and lifestyles have evolved dramatically, the fundamental aspects of human nature remain constant. This serves as a reminder that despite external changes, our inner struggles, desires, and relationships with God are timeless. Ultimately, Tozer calls for a deeper understanding of our unchanging internal selves amidst a changing world.