Who said "The mind is like a muscle—it requires constant exercise."?

This quote is attributed to Frasier Crane.

The mind is like a muscle—it requires constant exercise. - Frasier Crane

"The mind is like a muscle—it requires constant exercise."

Frasier Crane Knowledge

"I'm listening."

"Tossed salad and scrambled eggs."

"It's a Frasier kind of day."

"Excelsior!"

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."