Who said "Work that doesn't challenge you is work you're wasting."?

This quote is attributed to Julius Rosenthal.

Work that doesn't challenge you is work you're wasting. - Julius Rosenthal

"Work that doesn't challenge you is work you're wasting."

Julius Rosenthal Work

Banker & Philanthropist American 1862–1928

"Life is what happens while you are busy making other plans."

"The only way to do great work is to love what you do."

"In the middle of difficulty lies opportunity."

"Love is the bridge between two hearts."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."