Who said "The mind must be trained like any other muscle."?

This quote is attributed to The Ancient One.

The mind must be trained like any other muscle. - The Ancient One

"The mind must be trained like any other muscle."

The Ancient One Education

"The universe is not only queerer than we suppose, but queerer than we can suppose."

"Time is the most precious resource in existence. Use it wisely."

"Fear is the mind-killer. It clouds judgment and prevents growth."

"Power is not measured by what you can destroy, but by what you can create."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."