Idioms to describe diligent study: I am so angry that I forget to eat and sleep, I don't let go of my books, I don't hesitate to steal light, I don't hesitate to ask questions, I forget to eat and sleep, and I hang my beam and stab my stock.
A lazy youth, a lousy age.
There is a road in the mountain of books, but there is no limit to learning the sea.
Diligence is good at diligence, waste is good at play.