And just like that, Doctor tells Rory, that his heart and his soul consist of so much pure and good and love and human essence that it’s impossible to convert him into plastic soldier stripped off will. That even when being plastic, a creature, a thing, he’s the most human of them all and he had always been. It’s not scientific assessment, though stated so casually, like a random trivia amidst all that babbling. He’s not even looking at him then, because to him it’s something so unquestionable and obvious. Something sitting in his heart the moment he met Rory. Rory is heart and soul to him. Rory is the epitome of humanity to him. He is an example of virtue, devotion to his values and empathy everyone should follow. There is no more powerful gift, weapon and strength than human’s heart and soul. Rory has the essence of it, he is the best of humanity in Doctor’s eyes. Even when he’s not human, he is still incorruptible in his human heart and soul. He is a reminder for the Doctor why he loves humanity so much, believes in them so much, and prays to them in times of weakness and fear. Because sometimes he meets someone so pure, so good, so beautiful on the inside and outside, someone who fuels his faith and love for that species so that it can never die down, forever rooted in his hearts. Faith is so whimsical and challenging because you believe in something you cannot touch or prove. Rory is the proof, the solid evidence that it was all worth it, always worth it. To love them, to be there for them, to believe in them and to finally save them over and over again.
And Rory looks so ashamed and almost confused, because to him, showing heart and soul in everything he does is something subconscious, involuntary. He does not act according to both, HE IS BOTH. And this humility makes it even more disarming. Silent heroism of someone not asking for glory or attention, shining so brightly, delivering hope and faith just by being himself.