2 people find clearing in jungle. Don't observe a gardener, sceptic says there's no gardener. Other person believes they come at night, they stay up at night, non believer still doesn't believe. Other says gardener must be invisible. Put an electric fence and dogs, still nothing. Person says must be odourless and intangible. Sceptic asks how the two differ. Flew shows how a statement can start as assertion about world, but then modified bit by bit so ends up not being assertion. For Flew, this has significant implications for religious assertions.