According to Kant, "as man is a free (moral) being, the notion of duty can contain only self-constraint (by the idea of the law itself), when we look to the internal determination of the will (the spring), for thus only is it possible to combine that constraint (even if it were external) with the freedom of the elective will. The notion of duty then must be an ethical one."

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According to Kant, the notion of duty contains self-constraint by the idea of the law itself for the internal determination of the will to combine constraint with freedom of the elective will, making it an ethical notion.

According to Kant, "As Man Is a Free (Moral) Being