"Let us assume, for the time being, that the pregnant woman and the fetus she carries within her body have come before the law as equal “persons.” The woman desires an abortion. May the state legitimately intervene to prevent the abortion? At the present stage of medical knowledge and ability to control human incubation, the fetus cannot survive and develop into a separate self-sustaining person without contribution of the bodily force of the single female individual who carries that particular fetus within her body. Yet the laws prohibiting and regulating abortion, unlike all other laws in respect of persons, compel this pregnant woman to breathe, process food and donate blood for the sustenance of another human entity, either fully or partially developed. In no other instance does the law compel one individual to donate his/her bodily force to another individual. In no other instance does the law give another human—even a fully developed human—a right to life beyond that which the person himself can sustain."