Full Idea
Hume's contemporary critics are correct. He never really shows how it is possible for a habit, however strong it may be, to generate the concept of necessity.
Gist of Idea
Hume never shows how a strong habit could generate the concept of necessity
Source
comment on David Hume (Enquiry Conc Human Understanding [1748]) by Harré,R./Madden,E.H. - Causal Powers 3.II
Book Reference
Harré,R/Madden,E.H.: 'Causal Powers: A Theory of Natural Necessity' [Blackwell 1975], p.63
A Reaction
This is a powerful objection which hadn't occurred to me. Presumably eighteenth century critics are referred to? I suppose if a necessity is what 'cannot be otherwise', a very deeply ingrained habit might seem that way - but in me, not in the world.