It's from a page of "Our Mutual Friend". The specific phrases/vocabulary I didn't understand are in bold, while the general gists which are lost on me are in italics:
'I merely referred', Mr Podsnap explained, with a sense of meritorious proprietorship, 'to Our Constitution, Sir. We Englishmen are Very Proud of our Constitution, Sir. It Was Bestowed Upon Us By Providence. No Other Country is so Favoured as This Country. [...]
'And other countries?', said the foreign gentleman. 'They do how?'
'They do, Sir,' returned Mr Podsnap, gravely shaking his head; 'they do - I am sorry to be obliged to say it - as they do.'
'It was a little particular of Providence,' said the foreign gentleman laughing; 'for the frontier is not large'
'Undoubtedly,' assented Mr Podsnap; 'But So it is. It was the Charter of the Land. This island was Blest, Sir, to the Direct Exclusion of Other Countries as - as there may happen to be. And if we were all Englishmen present, I would say, 'added Mr Podsnap, looking round upon his compatriots, and sounding solemnly with this theme, 'that there is in the Englishman a combination of qualities, a modesty, an independence, a responsibility, a repose, combined with an absence of everything calculated to call a blush into the cheek of a young person, which one would seek in vain among the Nations of the Earth.'
Having delivered this little summary, Mr Podsnap's face flushed, as he thought of the remote possibility of its being at all qualified by any prejudiced citizen of any other country; and, with his favourite right-arm flourish, he put the rest of Europe and the whole of Asia, Africa and America nowhere.
(*Is the capitalisation of certain words meant to signify irony?)
Thanks very much.