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

Grounding for the Metaphysics of Morals) is the first of Immanuel Kant’s mature works on moral philosophy and remains one of the most influential in the field. Kant conceives his investigation as a work of foundational ethics-one that clears the ground for future research by explaining the core concepts and principles of moral theory, and showing that they are normative for rational agents.