“People sometimes accuse me of knowing a lot. "Stephen," they say, accusingly, "you know a lot." This is a bit like telling a person who has a few grains of sand clinging to him that he owns much sand. When you consider the vast amount of sand there is in the world such a person is, to all intents and purposes, sandless. We are all sandless. We are all ignorant. There are beaches and deserts and dunes of knowledge whose existance we have never even guessed at, let alone visited.”

“To a person who expects every desert to be barren sand dunes, the Sonoran must come as a surprise. Not only are there no dunes, there's no sand. At least not the sort of sand you find at the beach. The ground does have a sandy color to it, or gray, but your feet won't sink in. It's hard, as if it's been tamped. And pebbly. And glinting with -- what else -- mica.”

“Through the mind like an oyster labors on and on, / A grain of sand is all we have”

“Think of your life as an hourglass. You know there are thousands of grains of sand in the top of the hourglass; and they all pass slowly and evenly through the narrow neck in the middle. Nothing you or I could do would make more than one grain of sand pass through this narrow neck without impairing the hourglass. You and I and everyone else are like this hourglass...if we do not take [tasks] one at a time and let them pass...slowly and evenly, then we are bound to break our own...structure.”

“As you know, this little grain of sand has mass. A very small mass, but mass nonetheless."And because this grain of sand has mass, it therefore exerts gravity. Again, too small to feel, but there."Now," Katherine said, "if we take trilions of these sand grains and let them attract one another to form... say, the moon, then their combined gravtiy is enough to move entire ocreans and drag the tides back and forth across our planet.”

“We are like children building a sand castle. We embellish it with beautiful shells, bits of driftwood, and pieces of colored glass. The castle is ours, off limits to others. We’re willing to attack if others threaten to hurt it. Yet despite all our attachment, we know that the tide will inevitably come in and sweep the sand castle away. The trick is to enjoy it fully but without clinging, and when the time comes, let it dissolve back into the sea.”