Who said "Fear is often our greatest teacher."?

This quote is attributed to Niles Crane.

Fear is often our greatest teacher. - Niles Crane

"Fear is often our greatest teacher."

Niles Crane Fear

"I'm not drinking to escape reality, I'm drinking to enhance it."

"The mind is a terrible thing to waste, but a wonderful thing to refine."

"One must maintain certain standards, or civilization crumbles."

"Love is the most exquisite torture known to mankind."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."