Kant's Grounding for the Metaphysics of Morals discusses the difference between things that are unconditionally good and those that are good only under certain conditions. Kant argues that a good will is the only thing that is unconditionally good. He also discusses the difference between acting from duty versus acting for other reasons like reward or inclination. Kant proposes the categorical imperative as the moral law: to act only according to maxims that one can universalize as applying to all people. He provides examples of actions that fail the categorical imperative test by either not being universally applicable or by being actions one could not consistently will to be universalized.