1. When people help me, I will never forget it; when I help others, I won’t forget it. ——Hua Luogeng.

2. Life needs a grateful heart to create, and a grateful heart needs life to nourish. ——Wang Fu.

3. Despicable people are always ungrateful: Being ungrateful is originally a part of being despicable. ——Hugo.

4. An ungrateful person cannot be saved if he is in trouble. ——Greek proverb.

5. Gratitude is the least of virtues, and ingratitude is the worst of vices. ——British proverb.

6. Ignorant people want to do good things, but end up doing harm to others; a little magpie plucks out its mother's feathers, thinking it is repaying the kindness of raising her. ——Tibetan proverb.

7. The bees sipped honey from the flowers and thanked them Yingying when they left. The flamboyant butterfly believes that the flower should thank him. ——Tagore.

8. If you don’t become a householder, you don’t know how valuable firewood and rice are; if you don’t raise children, you don’t know how to repay your mother’s kindness. ——Chinese proverb.

9. Every kind of favor has a barb, which will hook the mouth that swallows the favor, and the benefactor will drag him wherever he wants. ——Tang En.

10. Ingratitude is worse than lying, vanity, gossip, drunkenness, or any other evil that exists in the fragile heart. ——British proverb.