The Law of Raspberry Jam: the wider any culture is spread, the thinner it gets.
Anyone nit-picking enough to write a letter of correction to an editor doubtless deserves the error that provoked it.
You've got to think about big things while you're doing small things, so that all the small things go in the right direction.
You can use all the quantitative data you can get, but you still have to distrust it and use your own intelligence and judgment.
No serious futurist deals in prediction. These are left for television oracles and newspaper astrologers.
Nobody knows the future with certainty. We can, however, identify ongoing patterns of change.