“Joy, sadness, confidence, anxiety, love, hatred, fear-all of these feelings and thousands more that make up the human "heart" are as useless to the living dead as the organ of the same name. Who knows if this is humanity's greatest weakness or strength? The debate continues, and probably will forever.”

“Fear, Sadness. They're not weaknesses. They are overpowering, defining emotions. They make you human, Sophie.”

“There were thousands and thousands of forms of joy in the world, but that all were essentially one and the same, namely, the joy of being able to love.”

“Nothing makes an android feel more useless than when a human is crying.”

“We, or at least I, can have no conception of human life and human thought in a hundred years or fifty years. Perhaps my greatest wisdom is the knowledge that I do not know. The sad ones are those who waste their energy in trying to hold it back, for thy can only feel bitterness in loss and no joy in gain.”

“The Elders had nothing but contempt for human emotion; they considered it their biggest weakness. Perenelle knew it was humankind's greatest strength.”