I'd never heard of William Watsony. The part Chesterton quoted is highlighted. Today we call this "authenticity."
I have not paid the world
The evil and the insolent courtesy
Of offering it my baseness for a gift.
And unto such as think all Art is cold,
All music unimpassioned, if it breathe
An ardour not of Eros' lips, and glow
With fire not caught from Aphrodite's breast,
Be it enough to say, that in Man's life
Is room for great emotions unbegot
Of dalliance and embracement, unbegot
Ev'n of the purer nuptials of the soul ;
And one not pale of blood, to human touch
Not tardily responsive, yet may know
A deeper transport and a mightier thrill
Than comes of commerce with mortality.