Where did this Emanuel Lasker quote come from? In the book by the late master Irving Chernev "The Chess Companion" he gives a list of chess quotes. My favourite one was:

"The student can learn more in ten hours of properly tutored instruction than in 10 years of trial and error" : Dr Emanuel Lasker. 

I might not have this quote absolutely right. If not this is very close; it might be the student 'would'...rather than the student 'can'. Anyway, I have never managed to trace this quote. Was it in Lasker's books, chess lectures such as the London lectures, or in his chess annotations? Or did he just say it? If so was it at a chess tournament or somewhere notable? 

I'd like to know. Not out of skepticism. I have faith in Chernev. Rather, because it's my favourite quote! I also wonder if it was in German - Dr Lasker was German. If it is a translation then please keep in mind that I only understand English.
The correct wording is "properly taught, a student can learn more in a few hours than he would find out in ten years of untutored trial and error". The oldest reference to the quote I found is in this newspaper article of 1973.