What quotes are there throughout the novel about a real gentleman?

From the text:

“Whether you scold me or approve of me,” returned poor Biddy, “you may equally depend upon my trying to do all that lies in my power, here, at all times. And whatever opinion you take away of me, shall make no difference in my remembrance of you. Yet a gentleman should not be unjust neither,” said Biddy, turning away her head.

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“Yet a gentleman may not keep a public-house; may he?” said I.

“Not on any account,” returned Herbert; “but a public-house may keep a gentleman. Well! Mr. Havisham was very rich and very proud. So was his daughter.”

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But that he was not to be, without ignorance or prejudice, mistaken for a gentleman, my father most strongly asseverates; because it is a principle of his that no man who was not a true gentleman at heart ever was, since the world began, a true gentleman in manner. He says, no varnish can hide the grain of the wood; and that the more varnish you put on, the more the grain will express itself.