1. Xu Rusi: Cruelty will not be softened by tears. On the contrary, tears are the food of cruelty.

2. Shakespeare: Cruelty has sharp teeth.

3. Montaigne: Cowardice is the mother of cruelty.

4. Seneca: All cruelty is caused by timidity.

5. Emerson: Barbaric people can come up with despicable and cruel tricks at any time.

6. Langdon: Of all cruelties, none is more unbearable than cruelty in the name of mourning and comfort.

7. Cy Johnson: Nothing can awaken people's attention more than cruel stories.

8. Montaigne: The horror of cruelty made me inclined to kindness more than any example of kindness could do.