Hume 250 years later
Two hundred and fifty years ago today, David Hume died in Edinburgh. He faced death as he had faced everything else: without illusion, and without fear. Adam Smith, who was there, wrote that he had "never seen so much real philosophy in the temper of any man." That temper is worth remembering, because it came from somewhere. It came from Hume's whole method of looking at the world.
Hume asked a simple question and refused to look away from the answer. How do we actually know anything? Not how should we know it, in some ideal world of pure reason. How do we, in fact, come to believe what we believe? He looked, and he found habit and custom. He found the mind forming expectations from repeated experience, and mistaking the strength of the expectation for a law of nature. Cause and effect, that supposedly iron chain binding the universe together, turned out to be something far more modest: one thing following another, often enough that we stop being surprised.
This was not skepticism for its own sake. Hume was not trying to unsettle people. He was trying to be honest about the limits of what reason can deliver, and honest about how much of ordinary life runs on something other than reason. Custom, sentiment, habit: these are not embarrassments to be argued away. They are the actual machinery of belief and action, in Hume's account, and pretending otherwise is the real error.
This is congenial, because it describes how knowledge actually advances. Not by grand deduction from first principles, but by trial and error. We try things. Some work and some do not. What works, we keep. What fails, we discard. This is Hume's empiricism doing practical work: no privileged access to certainty, just the steady accumulation of what experience confirms and the steady abandonment of what it refutes.
Popper gave this a formal shape two centuries later with falsification, but Hume had already cleared the ground. He had already shown that certainty was never on offer, and that the search for it was a distraction from the more useful business of learning from what happens.
There is a lesson in this for anyone tempted by systems that promise to have worked it all out in advance. Hume's skepticism was not an excuse for paralysis. He wrote history, he wrote economics, he held that commerce and liberty reinforced each other long before that became a respectable thing to say in Edinburgh drawing rooms. He acted, argued, and lived, all while denying himself the comfort of certainty. That combination, modest about foundations and energetic about conclusions, is rarer than it should be.
He also gave the is-ought problem to every generation that followed, and it has never gone away. You cannot get a moral conclusion from a purely factual premise without smuggling in some further assumption. Hume noticed this and stated it plainly, and it remains one of the cleanest traps in philosophy for anyone who tries to derive values from facts alone by sleight of hand. Economists and moralists both still fall into it. Hume simply pointed out where the ground gave way.
None of this made him gloomy. Smith's account of his last weeks describes a man joking about his own death, reading Lucian's dialogues of the dead, wondering aloud what excuse he might offer Charon for wanting a little more time. That lightness was not bravado. It followed from the same outlook that produced the philosophy. If you have already given up the comforting fictions, dying honestly is not much harder than living honestly. He had practised both.
Two hundred and fifty years on, the habits of mind he described are still the ones we actually use, however much grander language we dress them in. We still learn from experience rather than pure deduction. We still mistake strong custom for necessary truth, more often than we would like to admit. And we still owe a great debt to the man who looked at all this steadily, without flinching, and wrote it down.
Madsen Pirie