Immanuel Kant 
Fundamental Principles of the Metaphysic of Morals [EPUB ebook] 

Kant’s Fundamental Principles of the Metaphysics of Morals is a crucial work in modern moral philosophy, standing alongside the likes of Plato, Aristotle, Machiavelli, and Hobbes. In this piece, Kant aims to explain and uphold the Categorical Imperative — the key principle behind moral reasoning — and to establish the groundwork for a comprehensive understanding of justice and human virtues.