What is tidy sum?

Famous quotes containing the words sum and/or tidy:

    If the twentieth century is to be better than the nineteenth, it will be because there are among us men who walk in Priestley’s footsteps....To all eternity, the sum of truth and right will have been increased by their means; to all eternity, falsehoods and injustice will be the weaker because they have lived.
    Thomas Henry Huxley (1825–95)

    When the Somalians were merely another hungry third world people, we sent them guns. Now that they are falling down dead from starvation, we send them troops. Some may see in this a tidy metaphor for the entire relationship between north and south. But it would make a whole lot more sense nutritionally—as well as providing infinitely more vivid viewing—if the Somalians could be persuaded to eat the troops.
    Barbara Ehrenreich (b. 1941)