Who said "Gratitude is what lesser beings show their betters."?

This quote is attributed to Dr. Robotnik.

Gratitude is what lesser beings show their betters. - Dr. Robotnik

"Gratitude is what lesser beings show their betters."

Dr. Robotnik Gratitude

"I am the world's greatest scientific genius!"

"Sonic, you blue pest, I'll get you yet!"

"Roboticize the world!"

"Science is the key to ultimate power."

"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"