According to Immanuel Kant, there is essentially one fundamental moral duty:

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Each and every human being possesses a fundamental human right to be treated with respect, and that this right creates duties on the part of every human to respect the rights of others. Eighteenth-century philosopher Immanuel Kant expressed this as the fundamental duty to treat each person as an end in themselves and never only as means to our own ends.

According to Immanuel Kant, There Is Essentially One Fundamental Moral