程门立雪

stand outside the door on a snowy day waiting for Cheng Yi（程颐）to wake up and give instructions ［a reference to Yang Shi（杨时）and You Zuo（游酢）in the Song Dynasty who waited patiently and respectfully outside the house for their teacher Cheng Yi on a snowy day in order to pay tribute to him until snow piled up one- chi deep］—revere the teacher and respect his teachings