Who said "The measure of a life is not its length, but its depth."?

This quote is attributed to Mary Shelley.

The measure of a life is not its length, but its depth. - Mary Shelley

"The measure of a life is not its length, but its depth."

Mary Shelley Life

Novelist English 1797–1851

"Nothing is so painful to the human mind as a great and sudden change."

"Beware; for I am fearless, and therefore powerful."

"Life and death appeared to me ideal bounds, which I should first break through."

"I have crossed oceans of time to find you."

"Life is meant to be lived with passion."

"Life is what happens when you're busy making other plans."

"Life is a journey, not a destination."

"Life's too short for regrets."