Final answer:
An action has moral worth for Kant when it is done from the combination of a sense of duty and the correct motive. This is based on the will to act according to universal maxims, rather than emotions, consequences, or pleasure.
Step-by-step explanation:
The combination that produces an action of moral worth for Immanuel Kant is motive and duty. According to Kant's moral philosophy, an action is only truly morally worthy if it is done from a sense of duty and the right motive, which is the will to act according to a universal maxim that could be adopted by everyone without contradiction. This contrasts with acting based on rationality and consequences, which might align with utilitarian views, or seeking maximal pleasure and minimal pain, which is more hedonistic. Importantly, Kant argued that actions done from emotions and passions are not morally worthy, as they are contingent on personal feelings and not on a universal moral law.