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Is there such a thing as a completely private language (#94)? Does learning |
a language require learning a rule (#95)? Does learning a rule require |
learning a language (#96)? When there is translation, is there also interpretation |
(#97, #98)? If there are true statements that contain abstract objects, |
does that mean those abstract objects exist (#99)? Is mathematical Platonism |
the best way to explain mathematical knowledge (#100)? |
How to Use This Book |
Block quotations are provided to show how the argument is presented in |
the text. |
P1. Premises are marked β P. β |
P2. A premise is a statement that is either true or false and is given as evidence |
or a reason for accepting the conclusion; a conclusion is the statement |
that is argued for and supported by the premises. |
C1. Conclusions, of which there may be many, are marked with β C β |
and are indented. Conclusion indicators β for example, β therefore β |
and β hence β β have been omitted. The rule of inference or replacement |
is listed after deductive conclusions. |
In the boxed area that precedes the arguments, you will fi nd a reference |
list of original and secondary sources. |
Part I |
Philosophy of Religion |
1 |
Aquinas β Five Ways |
Timothy J. Pawl |
St. Thomas Aquinas (1224/5 β 74) offered his Five Ways, or fi ve proofs for |
the existence of God, near the beginning of his magnum opus , the Summa |
theologiae (Part 1, Question 2, Article 3, the response). The Summa (ST), |
as it is often called, was written as a textbook for men in their priestly |
formation. It is well over 2,500 pages in a standard English translation from |
the Latin, but the Five Ways take up only slightly more than one page. |
All quotations from Aquinas are taken from Alfred Freddoso β s translation of |
the Summa theologiae , available online at www.nd.edu/ βΌ afreddos/summa - |
translation/TOC - part1.htm |
Baisnee , Jules . β St. Thomas Aquinas β s Proofs of the Existence of God |
Presented in Their Chronological Order , β in Philosophical Studies in |
Honor of the Very Reverend Ignatius Smith, O.P. , edited by John K. |
Ryan , 29 β 64 . Westminster : The Newman Press , 1952 . |
Bochenski , Joseph M. β The Five Ways , β in The Rationality of Theism , edited |
by Adolfo Garc Γ a de la Sienra , 61 β 92 . Atlanta, GA : Rodopi , 2000 . |
Kenny , Anthony . The Five Ways: Saint Thomas Aquinas β Proofs of God β s |
Existence . Oxford : Oxford University Press , 1969 . |
Pawl , Timothy . β The Five Ways , β in The Oxford Handbook of Thomas |
Aquinas , edited by Brian Davies and Eleonore Stump . Oxford : Oxford |
University Press , 2011 . |
Just the Arguments: 100 of the Most Important Arguments in Western Philosophy, |
First Edition. Edited by Michael Bruce and Steven Barbone. |
Β© 2011 Blackwell Publishing Ltd. Published 2011 by Blackwell Publishing Ltd. |
10 Timothy J. Pawl |
Nevertheless, they are almost assuredly the most commented on section of |
the Summa and some of the most well - known arguments for the existence |
of God. |
One should note that while each Way concludes with some variation of |
β and this we call God, β Aquinas did not intend the Five Ways to be demonstrations |
of a uniquely Christian God. In fact, he warns against attempts |
to prove, for instance, that God is triune (three persons but one being, as |
Christians affi rm), since such arguments, he explains, will fall short and |
lead unbelievers to scoff (see his Summa contra gentiles , Book 1, Chapter |
9, paragraph 2). Furthermore, Aquinas did not take the Five Ways to show |
that this thing we call β God β is perfect, good, immutable, eternal, powerful, |
knowledgeable, or even that there is just one such thing. As a consequence, |
some common criticisms of the Ways β for instance, that they do not demonstrate |
an omnipotent being β clearly miss the mark. Aquinas goes on later |
to devote many pages to whether the thing we call β God β in the Five Ways |
is omnipotent. And the same is true for the other abovementioned attributes. |
Rather, Aquinas β intent in the Five Ways is to show that there is something - |
or - other that, for instance, causes things but is itself uncaused, or something |
that is necessary and does not have that necessary existence from another. |
In fact, he does not argue that the Five Ways conclude to the same thing |
β rather than fi ve different things β until later in the Summa (Part 1, |
Question 11, Article 3, the response). |
Finally, it is important to note that while the Five Ways are Aquinas β |
most often cited arguments for the existence of God, they are not his most |
detailed or nuanced. The Summa , as said above, is a textbook of sorts, and |
written for an audience of common men in formation for the priesthood |
β not academics, scholars, atheists, or agnostics. To judge Aquinas β best and |
most powerful arguments for the existence of God, one would do better to |
look at the parallel passages from his other works rather than at his Summa |
(see Baisnee for a helpful list of these passages). That said, it is the arguments |
in the Summa that have received the most attention and have become, |
by any reasonable standard, some of the most important arguments in the |
Western intellectual tradition. |
The First Way β The Argument from Motion |
The First Way focuses on motion. By β motion, β Aquinas means the three |
sorts of accidental change that Aristotle differentiates: change of location |
(e.g., moving across the room), change in quality (e.g., heating up), and |
change in quantity (e.g., getting fatter). The general thrust of the argument |
is that anything changed in one of these ways is changed by something else. |
That something else, in changing the fi rst thing, either is itself changed or |
Aquinasβ Five Ways 11 |
remains changeless. A series of changing changers cannot proceed infi nitely. |
So there must be some fi rst, unchanging being. That being we call β God. β |
The argument below uses β F β as a variable governing end states of being |
correlated with the three sorts of motion mentioned above. For instance, |
one could substitute β across the room, β β hot, β or β fat β for F. Aquinas |
provides three detailed defenses of C3 in the Summa contra gentiles , Part |
1, Chapter 13. He considers the common objection that a thing can move |
itself (e.g., the runner moves himself when sprinting from the starting line) |
by saying that such cases are instances of a part moving a whole and not |
a thing moving itself. In P3, Aquinas says that the mover must be in a |
state of actuality relevant to F in order to make something F. The argument |