Silkworms in spring will weave until they die, and candles will drain the wick every night. "Spring silkworms die, and night candles burn their wick" comes from Li Shangyin's untitled time was long before I met her, but it took longer than we broke up, which means that spring silkworms don't spin silk when they die, candles burn to ashes, and wax oil dries up like tears. It has something in common with the spirit of teachers' silent dedication and willingness to contribute. Teachers, like spring silkworms, try their best to educate students until they are "exhausted"; They burn themselves like candles to light the way for students until "tears begin to dry".

Now it is used to describe the noble moral sentiment of teachers who are selfless and do not ask for anything in return, and depicts a spiritual realm of perseverance and dedication to the end.