This sentence comes from Ji Bolun's Ode to Mother. The full text is as follows:
The sweetest word a person's lips can utter is "mom", and the sweetest cry is the voice of "mom". This is a simple and meaningful word, full of hope, love, comfort and all the intimate, sweet and beautiful feelings in people's hearts. In life, mother is everything. When she is sad, she is a comfort; When depressed, she is hope; When she is weak, she is strength; She is a source of sympathy, pity, love and forgiveness.
Whoever loses his mother loses his chest, protects his hands and protects his eyes ... Everything in nature symbolizes and reveals motherhood.
The sun is the mother of the earth. She gave birth to the earth with heat and embraced it with light. The earth is the mother of trees and flowers. She gave birth to them and nurtured them until they grew up. Trees and flowers are also loving mothers of sweet and delicious fruits and energetic seeds. The mother of all things in the universe is the eternal and immortal absolute spirit full of beauty and love.
The word mother is hidden in our hearts, just like a stone buried deep in the earth. When we are sad and happy, the word will pop out of our mouths, just like the fragrance of roses overflowing when it rains in Mao Mao in Wan Li.