Violet Haberdasher said this quote

And as if the professor could read Henry's mind, he said, It's a curious thing, change. You never get used to it, and you're never sure where it comes from, but you better learn to expect it. I don't recognize the quotation. Henry frowned, trying to place it. That's because it isn't one. It is simply advice, and advice you'd be well advised to take, especially now.