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The world is moving so fast these days that the man who says it can't be done is generally interrupted by someone doing it.

The true genius shudders at incompleteness — and usually prefers silence to saying something which is not everything it ought to be.

Trend-following is not such a good model. It’s simply eroded. Things change and being able to adjust is what made Mr. Simons so successful. “Statistic predictor signals erode over the next several years； it can be five years or 10 years. You have to keep coming up with new things because the market is against us. If you don’t keep getting better， you’re going to do worse.