“I think - I think - I think how little they think what lies so near them.”
“Sarah smiled, one of those little childish smiles she was so good at. It very nearly broke the Doctor’s heart. ‘You know what I think? I think you don’t really regenerate at all. I think you just keep taking off masks.”
“The essence of the independent mind lies not in what it thinks, but in how it thinks.”
“Be what I think? But I think of being so many things!”
“It's not what they think of me that matters - but what I think of them.”
“I don't think anyone would think that an ellipsis represents doubt or anything. I think it's more, you know, hinting at the future. What lies ahead.”