“ "I've never minded it," he went on. "Being lost, that is. I had always thought one could not truly be lost if one knew one's own heart. But I fear I may be lost without knowing yours." ”
Source: Clockwork Prince
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Until this moment, I had not realized that someone could break your heart twice, along the very same fault lines. 
I wanted to know that he would be okay if I died. I wanted to not be a grenade, to not be a malevolent force in the lives of people I loved. 
We have three kinds of family. Those we are born to, those who are born to us, and those we let into our hearts. 
Then he made one last effort to search in his heart for the place where his affection had rotted away, and he could not find it. 
This creature softened my heart of stone. She died and with her died my last warm feelings for humanity. 