On a heavy snowy day, there was a young man named Yangshi went to visit his teacher Cheng Yi. He found his teacher was sleeping when he arrived at the house. So he waited in the snow because he didn't want to wake his teacher up. When his teacher finally got up and the snow was very thick. Since then people use this idiom to say some one respect his teacher.
程顥(1032-1085)、程頤(1033-1107)兄弟,均為北宋時(shí)期著名理學(xué)家和教育家。楊時(shí)和游酢去拜會(huì)當(dāng)時(shí)著名的理學(xué)家程頤。程頤正在閉目養(yǎng)神,楊時(shí)、游酢二人恭敬地站在一旁,等了很長(zhǎng)時(shí)間。程頤醒來(lái),門(mén)外已雪深一尺。后人就以“程門(mén)立雪”作為尊師重道的范例。“程門(mén)立雪”也可說(shuō)成“立雪程門(mén)”。
典故出自于《宋史·楊時(shí)傳》