disappointance is the nurse of wisdom
can you tell me the details of the sentence?
It looks as if it should probably read:
1. Disappointment is the nurse of wisdom.
"Disappointment" is the sadness that you feel, when something doesn't happen as you had hoped.
"The nurse of wisdom" is a metaphor, where "wisdom" is likened to a baby feeding at a woman's breast ("the nurse").
Thus the sentence means:
2. When things don't happen as you hoped, you become wiser.