Lucretius' work primarily discusses which of the following themes?

The theme of "Nature and Existence" is central to Lucretius' work, particularly in his poem "De Rerum Natura" ("On the Nature of Things"). This poem seeks to explore the nature of the universe, the principles of atomism, and the fundamental processes that govern life and existence. Lucretius draws heavily on the philosophical teachings of Epicurus, emphasizing a materialist view of the world, where everything, including the soul, is composed of atoms. He uses vivid imagery and poetic language to convey complex scientific ideas, illustrating how natural phenomena can be understood without resorting to myth or the supernatural.

The focus on nature encompasses not just the physical world, but also humanity's place within it, the mechanisms of life and death, and the pursuit of happiness through the understanding of nature. Lucretius advocates for a life guided by rational thought, free from the fears instilled by religion and superstition, which aligns perfectly with the theme of nature and existence. This exploration invites readers to reflect on their understanding of the world around them and their existence in it.