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What's the meaning of the phrase 'Milk of human kindness'?

Care and compassion for others.

What's the origin of the phrase 'Milk of human kindness'?

From Shakespeare’s Macbeth, 1605:

“Yet doe I feare thy Nature, It is too full o’ th’ Milke of humane kindnesse.”

Gary Martin

Writer and researcher on the origins of phrases and the creator of the Phrase Finder website. Over the past 26 years more than 700 million of his pages have been downloaded by readers. He is one of the most popular and trusted sources of information on phrases and idioms.