Who said "A mind without riddles is a mind without growth."?

This quote is attributed to Riddler.

A mind without riddles is a mind without growth. - Riddler

"A mind without riddles is a mind without growth."

Riddler

"Riddles are the most honest form of communication - they demand truth wrapped in mystery."

"A mind that cannot solve a puzzle is a mind that cannot live."

"Questions are the doorway to knowledge, answers are merely the threshold."

"The greatest riddle is why people fear enlightenment."