The milk of human kindness
Definition 1 of 1
Pro Tip 1/3Shakespeare Origin
The phrase originates from Shakespeare's 'Macbeth' and represents gentleness or kindness in human nature. 
In literature class, we analyzed how Lady Macbeth requested to be unsexed because she believed she had too much of the milk of human kindness.
Pro Tip 2/3Metaphorical Use
Used metaphorically to describe someone's gentle nature; not referring to actual milk. 
Even when he's strict, you can see the milk of human kindness in his decisions.
Pro Tip 3/3Emotional Connotation
Carries an emotional weight, often used to highlight a person's soft-heartedness despite a contrary appearance. 
The tough coach surprised us by showing the milk of human kindness to the losing team.