4. Don't go forward, don't know how far it is; If you don't study hard, you won't understand the truth. 5. Without pruning, trees will not grow straight; People are ignorant without learning.
6. It is better to dress yourself with pearls than to enrich yourself with knowledge. 7. Bees pick flowers to make sweet, while people read books to tell the truth.
8. Labor is the source of knowledge; Knowledge is the guide of life. 9. Knowledge is the torch of wisdom.