St. Thomas Aquinas
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St. Thomas Aquinas' First Two Ways in Proving the Existence of God
It is my view that God exists, and I think that Aquinas' first two ways presents a
successful argument for the existence of God. No doubt, the arguments have weak points
which are subjected to criticism but nonetheless, in my opinion, these propositions by
Aquinas do indeed accomplish their purpose in establishing the existence of a Greatest
Conceivable Being that is the unmoved mover and uncaused cause. I believe that this
ultimate Being is unchanging and started the universe, time and all matter and concepts
of existence. In my view, this Being is what we understand to be God.
St. Thomas Aquinas recognized that there were some people who doubted the
existence of God because, to them, logic did not allow for or explain God's existence. His
first two ways are two proofs based on logic and observation of nature in proving God's
existence to those who could not accept or believe God on faith alone. Aquinas' first way
is based on motion. He calls it the most obvious way. This first argument, the Argument
from Motion, tries to prove the existence of God as the first mover which is unmoved.
Now, it is certain as a matter of sense-observation that some things in this world are in
motion. Whatever is in motion, Aquinas states, is moved by something else. Aquinas then
defines one type of motion as the reduction of something from potentiality to actuality,
and says that nothing can make this movement except by something that is already in
actuality in the same respect as the first object is in potentiality. For example, something
which is actually hot, like fire, makes something which is potentially hot, like wood, to
be actually hot. In this way the fire moves and alters the wood. Now, it is not possible for
the same thing to be, at the same time and same respect, in actuality and in potentiality.
For instance, what is actually hot cannot simultaneously be potentially hot, though it may
simultaneously be potentially cold. So, it is impossible that in the same respect and same
manner anything should be both mover and moved. In this, Aquinas means that nothing
can move itself. Therefore, if something is in motion, it must have been put in motion by
something else, which must have been put in motion by yet another thing, and so on.
However, this cannot go on to infinity because there would never have been a first mover
and, consequently, no subsequent movers. After all, second movers do not move except
when moved by a first mover, just as a stick does not move anything except when moved
by a hand. Thus, this leads to the conclusion that there is a first mover which is not
moved by anything, and this first mover is what we understand to be God.
Summarizing Aquinas' first way, the argument states that objects are in motion,