Despite his love of hosting, conversation, and fine dining, Kant’s house was unadorned and austere. He had only one picture, which hung above his bureau. This picture was of Jean-Jacques Rousseau, who was only 12 years older than him. According to lore, the only time Kant failed to take his daily walk was when he received his copy of Rousseau’s Émile.

How did Rousseau’s outlook work its way into Kant’s moral philosophy? If for Rousseau, it is by following the “general will” that we can be said to be free, for Kant, it is by obeying those moral laws that we would will as universal laws. Moral laws that we would will as universal laws are given not by our individual will but by our rational will, which we have in common with all other rational beings.

We often experience this dichotomy in our minds: this is what I selfishly or frivolously want to do, and this is what I truly ought to do—because I want to live in a better society that abides by this rule, and would resent it if other people behaved in such a biased, thoughtless way.

To conform to the universal law is not to be a slave; on the contrary, it is to follow reason and free ourselves from our irrational and disordered appetites. For Kant, this capacity to overrule our individual will lies at the heart of our special dignity as human beings.

When obeying those moral laws that we could consistently and rationally will as universal laws, we are following the so-called Categorical Imperative, which might be re-stated as, “Always act such that the maxim of your action can at the same time be upheld as a universal law.”

This is similar to the much older Golden Rule of the Bible, according to which we should treat others as we would want to be treated.........

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