Who said "A healthy mind requires constant challenge."?

This quote is attributed to Indy.

A healthy mind requires constant challenge. - Indy

"A healthy mind requires constant challenge."

Indy Health

"It's not the years, honey, it's the mileage."

"Fortune and glory, kid."

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

"That's how we archaeologists tell time."

"You can't expect to be happy if you're surrounded by mess."

"Health and happiness - these are true wealth"

"How can you live like this? It's like a pigsty!"

"You're going to get sick living like this."