Prediction is very difficult, especially about the future.

The line is a wry, self-canceling joke: it states the obvious (“the future is uncertain”) while highlighting how confidently people speak about what cannot be known. Often invoked in science, economics, and politics, it cautions against overprecision and hubris in forecasting complex systems. Read more broadly, it also points to a human tendency to treat projections as facts, forgetting that predictions are conditional on assumptions and incomplete information. The humor makes the warning memorable: even when prediction is necessary, it should be paired with humility, probabilistic thinking, and openness to revision as new evidence arrives.

1) "It is difficult to make predictions, especially about the future."
2) "Making predictions is very difficult—especially about the future."
3) "It's hard to predict the future."