" She said there was comfort to be found in the permanence of mathematical truths, in the lack of arbitrariness and the absence of ambiguity. In knowing that the answers may be elusive, but they could be found. They were there, waiting, chalk scribbles away. “Nothing like life, in other words,” he said. “There, it’s questions with either no answers or messy ones. "

― Khaled Hosseini , And the Mountains Echoed