“Nothing is permanent but change.”
“Nothing in this world is permanent, the only thing that's permanent is change.”
“No changes are permanent, but change is.”
“...what do all the objects in the world have in common if not the fact of being- and of being nothing but- the provisional permanence of certain changes.”
“Nothing´s permanent. Nothing.”
“There really was nothing firm, nothing certain. Even here, even at this place where he thought he’d found something permanent—everything could change in a day. Everything could be lost so quickly.”