E. loves to share reasoning philosophy with me. Yesterday, our theme was inductive reasoning.
"If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck."
And there is the elephant test:
"It is difficult to describe, but you know it when you see it." This reasoning was actually used in a court case (Cadogan Estates Ltd v Morris).
As was "I know it when I see it". This phrase was used by Justice Potter Stewart to describe his threshold test for pornography in Jacobellis v. Ohio.
The medical profession also uses adages. "When you hear hoofbeats behind you, don't expect to see a zebra". In other words, what is an obvious diagnosis might not be. You might have a zebra.
"You can lead a fish to water but you can't cure its fin rot." John Buckle, a British politician.
"A man with a watch knows what time it is. A man with two watches is never sure." I must go check my watches. I believe I have gone on too long here.
What is your alleged favorite adage?