To act for the sake of persons as ends in themselves, to respect them, is not to pursue or promote them, but to value them as the unconditionally valuable beings they are. It is also to acknowledge that there are constraints on our treatment of persons, for to be an end in itself is also to be a limit--just as the end of the road puts a limit on our travels, so an end in itself puts an absolute limit on the subjective ends we may set, the means we may use to pursue them, and, very importantly, o