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regresses do not in fact exist. Many critics fi nd Aquinas β argument on this |
point unconvincing, so one advantage of Clarke β s argument is that it simply |
sidesteps this issue. According to Clarke, the problem with the idea of |
everything β s being just an infi nite regress of dependent beings caused by |
other dependent beings (equivalent to Aquinas β β sensible beings with effi - |
cient causes β ) is not that such regresses are impossible but that this would |
violate the Principle of Suffi cient Reason, an intuitive principle according |
to which (roughly) there is an explanation for every being and every fact. |
In such a case, there would be an explanation of the existence of every |
particular dependent being, and there would even be an explanation of the |
existence of that particular collection of dependent beings. There would |
not, however, be an explanation of the fact that there are any dependent |
beings at all, since no particular existing dependent being (or set of dependent |
beings) could explain this. That is, we would lack an explanation of the |
fact that there is something rather than nothing. Thus, there must be at |
least one self - existent being that explains why there is something rather |
than nothing. Elsewhere, Clarke undertakes to prove that this being has the |
other attributes that we normally associate with divinity. |
There has existed from eternity some one unchangeable and independent |
being. For since something must needs have been from eternity, as has been |
already proved and is granted on all hands, either there has always existed |
some one unchangeable and independent being from which all other beings |
that are or ever were in the universe have received their original, or else there |
has been an infi nite succession of changeable and dependent beings produced |
one from another in an endless progression without any original cause at all. |
Now this latter supposition is so very absurd that, though all atheism must |
in its accounts of most things [ . . . ] terminate in it, yet I think very few atheists |
ever were so weak as openly and directly to defend it. For it is plainly |
impossible and contradictory to itself. I shall not argue against it from the |
supposed impossibility of infi nite succession, barely and absolutely considered |
in itself, for a reason which shall be mentioned hereafter. But, if we consider |
such an infi nite progression as one entire endless series of dependent beings, |
it is plain this whole series of beings can have no cause from without of its |
existence because in it are supposed to be included all things that are, or ever |
were, in the universe. And it is plain it can have no reason within itself for |
its existence because no one being in this infi nite succession is supposed to be |
self - existent or necessary (which is the only ground or reason of existence of |
anything that can be imagined within the thing itself [ . . . ]), but every one |
dependent on the foregoing. And where no part is necessary, it is manifest the |
whole cannot be necessary β absolute necessity of existence not being an |
extrinsic, relative, and accidental denomination but an inward and essential |
property of the nature of the thing which so exists. (Clark, 10) |
20 Mark T. Nelson |
Rowe β s terminology: |
β dependent being β = β a being whose existence is explained by the causal |
activity of other things β |
β self - existent being β = β a being whose existence is explained by itself, |
that is, by its own nature β |
β positive fact β = β a fact whose obtaining entails the existence of at least |
one contingent being β |
β contingent being β = β a being such that it is logically possible for that |
being to exist and it is logically possible for that being not to exist β |
Principle of Suffi cient Reason (PSR): |
PSR1. For every being that exists or ever existed, there is an explanation |
of the existence of that being. |
PSR2. For every positive fact, there is an explanation of that fact. |
P1. Every being (that exists or ever existed) is either a dependent being or |
a self - existent being. |
P2. Not every being is a dependent being. |
C1. There exists a self - existent being (disjunctive syllogism, P1, P2). |
The argument is valid if it is interpreted as follows: |
P1 * . Every being is a dependent being or some being is a self - existent being. |
[Or: If no being is a self - existent being, then every being is a dependent |
being.] |
P2 * . It is not the case that every being is a dependent being. |
C1 * . Some being is a self - existent being (disjunctive syllogism, P1 * , P2 * ). |
The case for P1 * : |
P1 may appear to be a tautology, but it is not, because it rules out one type |
of case, namely, things whose existence is explained by nothing at all. |
Thus, it is equivalent to PSR1. |
The case for P2 * : |
P3. If every being is a dependent being, then if there is an explanation for |
the fact that any dependent beings exist (rather than nothing at all), this |
will be in terms of the existence of either the totality of dependent beings |
or some subset of that totality. |
P4. That any dependent beings exist at all (rather than nothing) is a positive |
fact (defi nitions of β dependent being β , β positive fact β ). |
The Contingency Cosmological Argument 21 |
P5. There is an explanation of every positive fact (PSR2). |
C2. There is an explanation for the fact that any dependent beings exist |
at all (instantiation, P4, P5). |
C3. If every being is a dependent being, then there is an explanation for |
the fact that any dependent beings exist (rather than nothing at all), |
in terms of the existence of either the totality of dependent beings or |
some subset of that totality (instantiation, P3, C2). |
P6. It is not possible to explain the fact that any dependent beings exist at |
all (rather than nothing) simply in terms of the existence of either the |
totality of dependent beings or of some subset of that totality. |
C4. It is not the case that every being is a dependent being ( modus tollens , |
C3, P6). |
Thus, P1 * depends on PSR1 and P2 * depends on PSR2, so, according |
to Rowe, the success of Clarke β s contingency argument turns on the truth |
or rational acceptability of the Principle of Suffi cient Reason itself. |
3 |
The Kalam Argument for the |
Existence of God |
Harry Lesser |
One of the most interesting arguments for the existence of God was developed |
by the philosopher β theologians of the Kalam, the tradition of mediaeval |
Muslim theology, and has recently been revived by William Craig, |