Lewis mentions Balfour’s Theism
and Humanism in one place, but the closest parallel to the argument Lewis used
in Miracles comes in Lewis’s book The Foundations of Belief, originally
published in 1895.
Balfour’s argument derives four
propositions from what he calls the “naturalistic creed.”
1) My
beliefs, in so far as they are the result of reasoning at all, are founded on
premises produced in the last resort by the “collision of atoms.”
2) Atoms,
having no prejudices in favour of truth, are as likely to turn out wrong
premises as right ones; nay, more likely, inasmuch as truth is one and error
manifold.
3) My
premises, therefore, in the first place, and my conclusions in the second, are
certainly untrustworthy, and probably false. Their falsity, moreover, is of a
kind which cannot be remedied; for any attempt to correct it must start from
premises not suffering from the same defect. But no such premises exist.
4) Therefore,
again, my opinion about the original causes which produced my premises, as it
is an inference from them, partakes of the same weakness; so that I cannot
either accurately doubt my own certainties or be certain of my own doubts.
In
other words, if naturalism, then skepticism. But if skepticism is true, then we
have to be as skeptical about naturalism as we are about anything else
Importantly,
Balfour considers the Evolutionary Rebuttal to this argument. Evolutionary
biology “establishes the existence of a machinery which, irrational thought it
may be, does really bend gradually, and in the long run, to produce true
opinions rather than false.” That machinery, of course, is natural selection.
This brings the organism into more and more perfect harmony with the
environment.
But
he finds the Evolutionary Rebuttal to be less than adequate. He writes:
But what an utterly inadequate basis
for speculation is here. We are to suppose that the powers that evolved in primitive
man and his animal progenitors in order that they might kill with success and
marry in security, are on that account, sufficient to explore the secrets of
the universe. We are to suppose that the fundamental beliefs on which these powers
of reasoning are to be exercised reflect with sufficient precision remote
aspects of reality, though they were produced in the main by physiological processes
which date from a stage of development when the only curiosities that had to be
satisfied were those of fear and those of hunger.
He
concludes:
I
do not think believe that any escape from these perplexities is possible unless
we are prepared to bring to the study of the world the presupposition that it was
the work of a rational Being, who made it intelligible, and at the same time made us, in
however feeble a fashion, able to understand it.
This is the Foundatons of Bellief, available in its entirety on Google Books.
The passages I quoted from start on p. 306.