Learning how to practice

I’ve been studying the great Bohemian violin teacher, Otakar Ševčík. He taught some of the greatest players of the early twentieth century, including Jan Kubelík and Jaroslav Kocian.

But here’s the secret to his success. In an interview for Pall Mall Magazine in 1910, the writer reports this:

"The professor not only teaches how to play, he teaches, above all, how to practice. This he considers all important."

Where there are new skills to be learned, isn’t that the secret to all teaching, all learning?

I wonder why it’s not more widely known?