"Once upon a time two explorers came upon a clearing in the jungle. In the
clearing were growing many flowers and many weeds. One explorer says,
"Some gardener must tend this plot." The other disagrees, "There is no
gardener." So, they pitch their tents and set a watch. No gardener....
So they set up a barbed wire fence. They electrify it. They patrol it with
bloodhounds... But no shrieks even suggest that some intruder intruder has
received a shock. No movements of the wire ever betray an invisible climber.
The bloodhounds never give cry. Yet still the Believer is not convinced.
"But there is a gardener, invisible, intangible, insensible to electric
shocks, a gardener who has no scent and makes no sound, a gardener who comes
secretly to look after the garden which he loves." At last the Skeptic
despairs, "But what remains of your original assertion? Just how does what
you call an invisible, intangible, eternally elusive gardener differ from an
imaginary gardener or even no gardener at all?"