I'm glad I never read Chesterton

I'm starting a new book, Little, Big, by John Crowley. The epigraph* for chapter 1 reads:

Men are men, but Man is a woman.

G.K. Chesterton

What the hell can that mean?

Google to the rescue, supplying the context for the quotation:

Individually, men may present a more or less rational appearance, eating, sleeping, and scheming. But humanity as a whole is changeful, mystical, fickle, delightful. Men are men, but Man is a woman.

'The Napoleon of Notting Hill.'

Sorry I asked.

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* Epigraph: "a quotation set at the beginning of a literary work or one of its divisions to suggest its theme." Thank you, m-w.com