When the fields of human knowledge are so various and so vast as is the case in our day, the utmost that can be done by single minds not of encyclopedic range, is to master one subject or branch of… — Henry Parry Liddon Copy Share Image
“[...] it is rare for a man who teaches to know his subject thoroughly; for if he studies it as he ought, he has in most cases no time left in which to teach it. [...]” — Arthur Schopenhauer Copy Share Image
![“[...] it is rare for a man who teaches to know his subject thoroughly; for if he studies it as he ought, he has in most cases no time left in which to teach it. [...]” quote by Arthur Schopenhauer](https://sms4smile.com/quotes/img-quotes/57f/arthur-schopenhauer-226_education_it-is-rare-for-a-man-who-teaches-to-know_3084311.jpg)