the milk of human kindness

US /ðə mɪlk əv ˈhjuː.mən ˈkaɪnd.nəs/
UK /ðə mɪlk əv ˈhjuː.mən ˈkaɪnd.nəs/
"the milk of human kindness" picture
1.

natural human sympathy, compassion, and benevolence

:
Despite his tough exterior, he still had the milk of human kindness within him.
Her cruel actions showed a complete lack of the milk of human kindness.