'Falling in love.' Such a funny little phrase, tossed about so casually. What had happened to her wasn't the least bit casual. 'Falling in love' didn't even begin to cover it. She'd fallen into him, all of him, a thousand years of lifetimes, spanning galaxies, and touching untold lives. People who'd never dream of his existence were safe and alive because of the Doctor. And she'd seen it all, lived it all, and far too often, died. And she'd do it all again. He was worth it. Worth this amazing, headlong fall into who-knows-what.
'Falling in love.' Such a silly little human phrase, they used it all the time on telly and in the cinema. But this…this was something so profound that it took his breath away. Clara had willingly stepped into his time stream, in the full knowledge that her single, fragile human life would be shattered into a million pieces, a million different lives and deaths, fully believing that she'd never emerge again. Beings whose existence she could just barely conceive of were alive because she'd risked everything for him. For the first time in all his long lives, he was truly humbled.