If we don’t know, then shouldn’t we morally opt on the side that is life? If you came upon an immobile body and you yourself could not determine whether it was dead or alive, I think that you would decide to consider it alive until someone could prove it was dead. You wouldn’t get a shovel and start covering it up. And I think we should do the same thing with regard to abortion.
— Ronald Reagan, quoted in Abortion: A Rational Look At An Emotional Issue by R. C. Sproul, p. 115