" Durnik needs a tower somewhere in the Vale," Belgarath was saying.
"I don't see why, father," Polgara replied.
"All of Aldur's disciples have towers, Pol. It's the custom."
"Old customs persist --even when there's no longer any need for them."
"He's going to need to study, Pol. How can he possibly study with you underfoot all the time?"
She gave him a long, chilly stare.
"Maybe I should rephrase that. "

― David Eddings , Seeress of Kell (The Malloreon, #5)