One can never have enough socks

He never seemed to grasp the immense mutability of human nature, nor to appreciate that behind every nondescript face lay a wild and unique hinterland like his own.

... there are far, far worse things in the living world than dying.

Oh, these people's minds work in strange ways, Petunia, they're not like you and me," said Uncle Vernon, trying to knock in a nail with the piece of fruitcake Aunt Petunia had just brought him.

What exactly is the function of a rubber duck?

Gringotts was the safest place in the world for something you wanted to hide — except perhaps Hogwarts.

Both could feel the relationship crumbling to pieces beneath the weight of everything that Gavin refused to say.