Who said "The only real limitation is the one you set for yourself."?

This quote is attributed to Muhammad Ali.

The only real limitation is the one you set for yourself. - Muhammad Ali

"The only real limitation is the one you set for yourself."

Muhammad Ali Freedom

Professional Boxer American 1942–2016

"Service to others is the rent you pay for your room here on Earth."

"He who is not courageous enough to take risks will accomplish nothing in life."

"Don't count the days, make the days count."

"Impossible is nothing."

"Freedom to pursue your passion is precious."

"Freedom comes at a cost."

"Order isn't restriction. It's freedom."

"Freedom comes with responsibility"