"The heart as in the true self. Not the muscle. You're not the first person to make that mistake - although the mistake was likely mine."

He pauses for a moment, smiles without humour, and adds- "I do have rather the scar, though. From when one of them stabbed me. See what reward I get? So many of them - I hated them for so long. Not that I could bring myself to believe that... I had no heart. I had no emotions. What was there to feel with? But I felt all the same.
There was one of us - a musician. He always claimed that we still retained some emotion. Most of us called him a fool - I certainly did. But I was the biggest fool of all. I call myself a scientist, and yet I deny the evidence that's in front of me?"