Who said "Work that does not challenge you does not develop you."?

This quote is attributed to Charles Flint.

Work that does not challenge you does not develop you. - Charles Flint

"Work that does not challenge you does not develop you."

Charles Flint Work

Businessman & Entrepreneur American 1850–1934

"The mind is everything. What you think, you become."

"Life is what happens when you're busy making other plans."

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

"Innovation distinguishes between a leader and a follower."

"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."