Who said "I have always been my own most demanding critic."?

This quote is attributed to Frida Kahlo.

I have always been my own most demanding critic. - Frida Kahlo

"I have always been my own most demanding critic."

Frida Kahlo Wisdom

Surrealist Painter Mexican 1907–1954

"Feet, what do I need you for when I have wings to fly?"

"I paint myself because I am so often alone and because I am the subject I know best."

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

"Courage is the base everything moral is built upon."

"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."