“Individual heart cells beat at their own rate when separated from one another, a phenomenon easily observed beneath a microscope. It has long been known that when they are pushed together, they will synchronize their pulses. Recent studies have shown, however, that heart cells begin to synchronize slightly before they touch. It is not known how they signal across this distance. Some scientists speculate that this method of communication may be able to cross great distances and may explain how social animals bond, or how pets seem to sense when their masters are coming home, or even how people fall in love, one heart calling to another.”

“You said you're going far away," Tamaru said. "How far away are we talking about?""It's a distance that can't be measured.""Like the distance that separates one person's heart from another's.”

“But that was the last time. That was…how should I say it? ... the one moment in my life when I was able to draw closest to Eri ... the one moment when she and I joined heart to heart as one: there was nothing separating us. After that, it seems, we grew further and further apart. We separated, and before long we were living in different worlds. That sense of union I felt in the darkness of the lift, that strong bond between our hearts, never came back again. I don't know what went wrong, but we were never able to go back to where we started from.”

“How curiously one is changed by the addition, even at a distance, of a friend. How useful an office one's friends perform when they recall us. Yet how painful to be recalled, to be mitigated, to have one's self adulterated, mixed up,become part of another.”

“Sometimes callers from a distance invade my solitude, and it is on these occasions that I realize how absolutely alone each individual is, and how far away from his neighbour; and while they talk (generally about babies, past, present, and to come), I fall to wondering at the vast and impassable distance that separates one's own soul from the soul of the person sitting in the next chair.”

“I thought it very touching to see these two women, coarse and shabby and beaten, so united; to see what they could be to one another; to see how they felt for one another, how the heart of each to each was softened by the hard trials of their lives. I think the best side of such people is almost hidden from us. What the poor are to the poor is little known, excepting to themselves and God.”