Who said that every inch of grass can reap three rays of spring light? This is a poem praising mother. In Meng Jiao's Wandering Son's Song, who said that a heart like an inch of grass can repay three spring lights, is often used to praise mothers. What does it mean, who said that a filial piety as weak as a grass can repay the motherly kindness of a mother who is like a spring light. This poem expresses the greatness of maternal love and also expresses appreciation for mothers.