Blessings brighten as they take their flight. meaning

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value

Blessings brighten as they take their flight.

expresses that:
Blessings are not valued untill they are no longer available; People tend to take many things for granted, and become aware of their value only when they are gone.
also
You never miss the water till the well runs dry

The cow knows not the value of her tail till she has lost it