Who said "The most profound truths are often the simplest."?

This quote is attributed to Mary Wollstonecraft Shelley.

The most profound truths are often the simplest. - Mary Wollstonecraft Shelley

"The most profound truths are often the simplest."

Mary Wollstonecraft Shelley Wisdom

Novelist Poet English 1797–1851

"Nothing contributes so much to tranquilize the mind as a steady purpose."

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"The beginning is always today."

"No creature is fully employed whose passions are not engaged."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."