"At the age of eleven, I had conceived an ardent desire to meet the great pedagogue Karl Czerny… My father had had lessons from the renowned teacher, so that I was well prepared to derive immediate benefit from his valuable instruction… It has been somewhat the fashion to underrate the services this really great man rendered to pianism; but we have only to point to the list of distinguished virtuosi who have come to him as to a fountain-head – Liszt, Thalberg, Döhler, Kullak … His studies are very valuable. He may well be called the Father of Virtuosi… His manner of teaching was somewhat that of an orchestral director. He gave his lessons standing, indicating the different shades of tempo and colouring by gestures. Czerny insisted principally on accuracy, brilliancy, and pianistic effects."
January 1, 1970
https://en.wikiquote.org/wiki/Carl_Czerny