"With age, the roots become stronger, and the sun shines brighter and the leaves become darker." This line is a poem praising the grace of old age.
From "Gu Tong" written by Wang Anshi in the Song Dynasty. The meaning of this poem is: The longer the age, the stronger the roots of the tung tree, the stronger the sunlight, the more luxuriant the leaves of the tung tree. It is used to describe people who grow older but have stronger aspirations. Even if they suffer bad luck, their spirit becomes stronger.