In the words of, among others, Killing Joke: "Unlearn, you must forget the values that you hold."
I've been following racing properly since 1977 and in that time the passing years weren't exactly awash with colts who ran stinkers in the 2,000 Guineas then won The Derby next time out.
Then O'Brien did it twice - and neither colt was a particularly big price given quite how badly they'd run at Newmarket.
There was also a time when multiple runners from Ballydoyle in The Derby seemed to coincide with them not winning the race that year.
But they've had multiple runners and won it, so the saying: "If you think you have two or more Derby horses you haven't got any" is manifestly flawed.
Trends are ephemeral and an open mind is key.
As stated, my main concern with The Lion In Winter (who is in my "Derbfolio," but at 7/1, not the 20/1 Maurice has cunningly secured) is he seems to me to be priced up like he was a Champion, or at least Group 1-winning, 2yo, who is now just waiting to bounce back to elite form.
He isn't - he's a middle-distance bred Acomb winner who wasn't sighted since as a juvenile and was sixth in the Dante after missing the 2,000 Guineas.
He might, at times, have put in the best Derby prep work any of them have ever seen at Ballydoyle, but he's still got a lot to prove on the actual racecourse.
And O'Brien's recent remark suggests Delacroix may have gone the better of the duo in their respective latest bits of work.
But there is still time for that to flip back the other way.
The Derby is never boring in my view and this promises to be an especially fascinating one.