Who said "The only thing that should be developed is kindness."?

This quote is attributed to Marilyn Monroe.

The only thing that should be developed is kindness. - Marilyn Monroe

"The only thing that should be developed is kindness."

Marilyn Monroe Kindness

Actress and Model American 1926–1962

"I am my own muse, I am the subject I know best. The subject I want to know better."

"Imperfection is beauty, madness is genius and it's better to be absolutely ridiculous than absolutely boring."

"A wise girl kisses but never tells."

"If you can make a woman laugh, you can make her do anything."

"A good man treats his wife with respect."

"Kindness always comes back around."

"The power of a smile can change everything."

"Kindness is weakness to some. Not to me."