Lucretius 
On the Nature of Things [EPUB ebook] 

On the Nature of Things is an epic didactic poem aiming to explain Epicurean philosophy to a Roman audience. Lucretius presents the principles of atomism; the nature of the mind and soul; explanations of sensation and thought; the development of the world and its phenomena; and explains a variety of celestial and terrestrial phenomena. The universe described in the poem operates according to these physical principles.