Who said "Gratitude is owed only to those who aid in achievement."?

This quote is attributed to Doctor Octopus.

Gratitude is owed only to those who aid in achievement. - Doctor Octopus

"Gratitude is owed only to those who aid in achievement."

Doctor Octopus Gratitude

"The cunning warrior attacks neither body nor mind... but the HEART."

"I'm something of a scientist myself."

"Back to formula!"

"You know, I'm something of a scientist myself."

"Gratitude makes life richer."

"A grateful heart is a happy heart."

"Respect those who came before us."

"Life's greatest treasures are the people we love"