Kant devised the cleverest trick in all moral philosophy. He reasoned that for moral rules to be laws, they had to be universally applicable. If gravity worked differently for men and women, or for Italians and Egyptians, we could not speak of it as a law. But rather than searching for rules to which all people would in fact agree (a difficult task, likely to produce only a few bland generalities), Kant turned the problem around and said that people should think about whether the rules guiding their own actions could reasonably be proposed as universal laws. If you are planning to break a
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Do On to others as you wish them to do unto you
