《颜氏家训·勉学篇》
学习就跟种树一样，春天可以赏玩它的花朵，秋天可以收获它的果实；评讲文章，就好像赏玩春天的花朵一样，修身利行，就好像收获秋天的果实一样。
夫学者犹种树也，春玩其华，秋登其实；讲论文章，春华也，修身利行，秋实也。
Studying is like planting a tree. Its flowers can be enjoyed in spring, and its fruits can be harvested in autumn. Commenting on articles is like enjoying the flowers in spring, while practicing self-cultivation and good conduct is like harvesting the fruits in autumn.