Who said "My gratitude is reserved for my own achievements."?

This quote is attributed to Dr. Robotnik.

My gratitude is reserved for my own achievements. - Dr. Robotnik

"My gratitude is reserved for my own achievements."

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"