the progress of studiescomes from hard work; a subject is mastered throughdiligent study
❍ ～，荒于嬉。(韩愈《昌黎先生集·进学解》) The progress of studies comes from hard workand is retarded by frivolities.
业精于勤yè jīnɡ yú qín
形容学业由于勤奋而精深。the essential of work is diligence, a subject is mastered through diligent study