I will argue that through the process of defining human beings, we can see that despite
intelligence, what define the accessibility to moral consideration is the sentience, the
quality that gives human the ability to feel and be aware of themselves and others.
According to Descartes, only beings with mind merit moral consideration. In his
point of view, every being with a central control in its head that can guide it or make
decision what to do next worth moral consideration. However, since a brain is the basic
feature that distincts animals from plants, all animals meet such requirements. It is an
inborn nature that every animal will send signal of what it want to its body and do
whatever it like. In this case, if we set the qualification for moral consideration to beings
with mind, every animal includes pig that only know eat and sleep would count. Since
moral consideration is only qualified for those who can act or think like human, such
theory is too broad for moral consideration. Rather than used to determine moral
consideration, such theory is best applied for the qualification to live in the world.
According to Aquinas, only beings with reason, intelligence merit moral consideration. In
his view, any beings that have the strong ability to think, analyze, calculate and make
decision objectively worth moral consideration. Although pure intelligent beings could
create the strong society in the world, they are too far from the concern of the moral
consideration. In their world, everything is absolutely correct or wrong. There can be
never a case that allows a kindly wrong behavior. For example, in the world of computer,
everything is absolutely right or wrong. People have given computer the smartest brain in