Who said "The greatest adventure is self-discovery."?

This quote is attributed to Knuckles.

The greatest adventure is self-discovery. - Knuckles

"The greatest adventure is self-discovery."

Knuckles Adventure

"I'm the last one standing!"

"Gotta protect this Master Emerald!"

"Nobody messes with the Master Emerald while I'm around!"

"I may not be the smartest guy, but I know what's right!"

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."