"Long ago, Sir Isaac Newton gave us three laws of motion, which were the work of genius. But Sir Isaac's talents didn't extend to investing: He lost a bundle in the South Sea Bubble, explaining later, 'I can calculate the movement of the stars, but not the madness of men.' If he had not been traumatized by this loss, Sir Isaac might well have gone on to discover the Fourth Law of Motion: For investors as a whole, returns decrease as motion increases."

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It is human life. We are blown upon the world; we float buoyantly upon the summer air a little while, complacently showing off our grace of form and our dainty iridescent colors; then we vanish with a little puff, leaving nothing behind but a memory - and sometimes not even that. I suppose that at those solemn times when we wake in the deeps of the night and reflect, there is not one of us who is not willing to confess that he is really only a soap-bubble, and as little worth the making.

— Mark Twain