Who said "The intellect must be constantly exercised."?

This quote is attributed to Frasier Crane.

The intellect must be constantly exercised. - Frasier Crane

"The intellect must be constantly exercised."

Frasier Crane Education

"I'm listening."

"Tossed salad and scrambled eggs."

"It's a Frasier kind of day."

"Excelsior!"

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."