Robert Burton 
The Anatomy of Melancholy [EPUB ebook] 

Although presented as a medical text, The Anatomy of Melancholy is as much a sui generis work of literature as it is a scientific or philosophical text, and Robert Burton addresses far more than his stated subject. In fact, the Anatomy uses melancholy as the lens through which all human emotion and thought may be scrutinized, and virtually the entire contents of a 17th-century library are marshalled into service of this goal.