Who said "Work hard for what you believe in."?

This quote is attributed to Abu.

Work hard for what you believe in. - Abu

"Work hard for what you believe in."

Abu Work

"Ooh ooh! Ooh ooh!"

"Abu wants the shiny thing!"

"No, no, no - that one's mine!"

"Monkey see, monkey do!"

"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."