Who said "You must work hard on yourself."?

This quote is attributed to Jack Ma.

You must work hard on yourself. - Jack Ma

"You must work hard on yourself."

Jack Ma

E-commerce Founder Chinese Born 1964 (age 62)

"Today is hard, tomorrow will be worse, but the day after tomorrow will be sunshine."

"Opportunities lie in the place where the complaints are."

"We are not here to work for money, we are here to realize our dreams."

"If you don't give up, you still have a chance."