"Groundwork for the Metaphysics of Morals" is a foundational text in moral philosophy written by Immanuel Kant. In this work, Kant explores the concept of morality and seeks to establish a basis for ethical principles that are universally applicable. He introduces the idea of the categorical imperative, a principle that guides moral actions based on their ability to be universally willed. Kant argues that moral actions must be performed out of duty and respect for the moral law, rather than for personal gain or inclination. He emphasizes the importance of rationality in ethical decision-making, asserting that true moral worth comes from acting according to reasoned principles that uphold human dignity and autonomy.