A System of Logic: Ratiocinative and Inductive, 7th Edition, Vol. II
John Stuart Mill · en
considered by them as a man _below par_ in the general powers of his
understanding; then, 'O what a lucky fellow! Well, Fortune _does_ favour
fools--that's for certain!--It is always so!' And forthwith the
exclaimer relates half a dozen similar instances. Thus accumulating the
one sort of facts and never collecting the other, we do, as poets in
their diction, and quacks of all denominations do in their reasoning,
put a part for the whole."
This passage very happily sets forth the manner in which, under the
loose mode of induction which proceeds _per enumerati onem simplicem_,
not seeking for instances of such a kind as to be decisive of the
question, but generalizing from any which occur, or rather which are
remembered, opinions grow up with the apparent sanction of experience,
which have no foundation in the laws of nature at all. "Itaque recte
respondit ille," (we may say with Bacon,[18]) "qui cum suspensa tabula
in templo ei monstraretur eorum, qui vota solverant, quod naufragii
periculo elapsi sint, atque interrogando premeretur, anne tum quidem
Deorum numen agnosceret, quæsivit denuo, _At ubi sunt illi depicti qui
post vota nuncupata perierunt?_ Eadem ratio est fere omnis
superstitionis, ut in Astrologicis, in Somniis, Ominibus, Nemesibus, et
hujusmodi; in quibus, homines delectati hujusmodi vanitatibus, advertunt
eventus, ubi implentur; ast ubi fallunt, licet multo frequentius, tamen
negligunt, et prætereunt." And he proceeds to say, that independently of
the love of the marvellous, or any other bias in the inclinations, there
is a natural tendency in the intellect itself to this kind of fallacy;
since the mind is more moved by affirmative instances, though negative
ones are of most use in philosophy; "Is tamen humano intellectui error
est proprius et perpetuus, ut magis moveatur et excitetur Affirmativis
quam Negativis; cum rite et ordine æquum se utrique præbere debeat; quin
contra, in omni Axiomate vero constituendo, major vis est instantiæ
negativæ."