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immoral. For instance, in one country cousins may marry; in another it is thought to be very immoral to do so; in one, men may marry their sisters-in-law; in another, it is regarded as immoral; in one country people may marry only once; in another, many times; and so forth. Similarly in all other departments, of morality we find that the standard varies greatly; yet we have the idea that there must be a universal standard of morality.
So it is with duty. The idea of duty varies much among different nation : in one country, if a man does not do certain things, people will say he has acted wrongly; and if he does those very things in another country, people will still say that he did not act rightly; and yet we know that there must be some universal idea of duty. In the same way, one class of society thinks that certain things are among its duty, and another class thinks quite the opposite and would be horrified if it had to do those things. Two ways are left open to us either the way of the ignorant,
