2. Ancient scholars must have teachers. -Han Yu
Silkworms in spring will keep spinning until they die, and the candles will dry the wick every night-Don Li Shangyin
3. Persuade, tirelessly teach people, be unknown, be a teacher, do your best, be conscientious,
4. Do your best until you die. (Zhuge Liang's "Model")
5. Crows have the intention of feeding back, and sheep know the grace of kneeling and breastfeeding.
6. A drop of grace will be rewarded by spring water.
7. But how much affection does an inch of grass have?
8. Bees sip honey from flowers and thank the camp when they leave. The grandiose butterfly thinks that flowers should thank him. Tagore
9. People help, never forget; Do not forget to help others. -Hua
10. Every favor has a barb, which will hook the mouth that devours the favor, and the benefactor can drag it wherever he wants-Don.
1 1. ingratitude is worse than lying, vanity, rap, drunkenness or other evils that exist in the hearts of vulnerable people-English proverb
12. Mean people are always ungrateful: ingratitude is part of meanness-Hugo.
13. An ungrateful person is hopeless if he is in trouble-Greek proverb