Stone and ice

"I don't understand you, Grandma."
"In that case, let me say one more thing you won't understand. It is another of my mother's sayings, and it is something we can both ponder. 'What you learn in childhood is carved on stone; what you learn in old age is carved on ice.'"
"Can we go home now, Grandma?"
"Of course, darling."
The Road From Home. David Kherdian, p.23