This is a quote I use very often! As with many other great quotes, I think it originates in English from Trevanian's Shibumi (when Otake-san, the Go master is giving his final teaching to Nicholai):
Do not fall into the error of the artisan who boasts of twenty years experience in his craft while in fact he has had only one year of experience — twenty times.
Most probably Trevanian has drawn upon some other source, tough I've never been able to track that.
If you haven't read this fantastic book I strongly recommend it.
It's an ok potboiler that relies ever-more improbable plot devices.
It's also impossibly incorrect politically -- so transparently so that I think it's essentially harmless. But if you don't understand why some people would feel that why you really should watch your step.
Do not fall into the error of the artisan who boasts of twenty years experience in his craft while in fact he has had only one year of experience — twenty times.
Most probably Trevanian has drawn upon some other source, tough I've never been able to track that.
If you haven't read this fantastic book I strongly recommend it.