The moral gravity of procured abortion is apparent in all its truth if we recognize that we are dealing with murder and, in particular, when we consider the specific elements involved. The one eliminated is a human being at the very beginning of life. No one more absolutely innocent could be imagined. In no way could this human being ever be considered an aggressor, much less an unjust aggressor! He or she is weak, defenceless, even to the point of lacking that minimal form of defence consisting in the poignant power of a newborn baby's cries and tears. The unborn child is totally entrusted to the protection and care of the woman carrying him or her in the womb. And yet sometimes it is precisely the mother herself who makes the decision and asks for the child to be eliminated, and who then goes about having it done.
~ Pope John Paul II, from Evangelium Vitae ~