Work · Hume
Enquiry Concerning Human Understanding
1748 · Twelve sections
The Treatise rewritten to actually be read: the problem of induction, sharpened.
12
Sections
1748
Published
Induction
The problem it sharpened
Hume’s Fork
Every claim worth anything, Hume argues, falls into one of two bins. The catch is that the whole of natural science lives in the right-hand bin, which means it rests on cause and effect, which rests on nothing firmer than past experience. That gap is the problem of induction.
The shape of the argument
Sections 1–3
The meaning-detector and the association of ideas: trace every idea back to the impression it copies, or treat it as empty.
Section 4
The fork, and the problem of induction: matters of fact rest on cause and effect, and cause and effect rest on nothing but past experience.
Sections 5–7
Custom as the answer: belief is habit, and the idea of necessary connection turns out to be the mind’s own expectation, projected onto the world.
Sections 8–11
The fork turned on the hard cases: liberty and necessity, miracles, and the argument for a designing providence.
Section 12
The sceptic’s conclusion: commit to the flames any book holding neither calculation nor experience, for it can contain nothing but sophistry and illusion.
The cast
Hume — rewrites the dead-born Treatise into the sharp, readable book he hoped would finally land
Hume’s Fork — the two-bin test that sorts every claim into the certain-but-empty or the informative-but-uncertain
Custom — the quiet hero: the habit that carries us where reason cannot, and the only source of the idea of necessity
Kant — reads Section 4 and spends the next era of philosophy trying to rebuild the floor Hume pulled up
The famous bits
Impressions and ideasSections 2–3
Every idea is traced to a prior impression; a word with no impression behind it carries no real idea.
Hume’s ForkSection 4
Relations of ideas or matters of fact: certain and empty, or informative and uncertain, with nothing in between.
The problem of inductionSection 4
That the future will resemble the past is the one assumption all reasoning leans on and none can prove.
Custom and habitSections 5–7
What reason cannot justify, habit performs: it is custom, not logic, that makes us expect tomorrow.
Of miraclesSection 10
No testimony can establish a miracle unless its falsehood would be a greater wonder than the event itself.
Commit it to the flamesSection 12
A book with neither abstract reasoning nor matters of fact holds only sophistry and illusion: burn it.