"A settled mind," she said, leaning in a little bit closer, "isn't nearly as fun as it sounds."

Anyway, she doubted his mind could ever truly be settled. That seemed to defy the laws of nature, the very physics of his person. That was one of the most exciting things about the Doctor. His active, rambling, complicated mind; the way he thought and the way he looked at things.

No. She never wanted anything about him 'settled.'

She offered him a sly smile. "And as for being a lab specimen, depending on the scientist, I can't say that I particularly mind."