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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. (2.22.52)
Pip is so concerned with externalities, appearances, and all the characteristics that society is fixated by that he forgets the grain of the wood.
He practised on her affection in that systematic way, that he got great sums of money from her, and he induced her to buy her brother out of a share in the brewery (which had been weakly left him by his father) at an immense price, on the plea that when he was her husband he must hold and manage it all. (2.22.52)
This is one of the only examples and evidence we have of feigned love.
All other swindlers upon earth are nothing to the self-swindlers, and with such pretences did I cheat myself. Surely a curious thing. That I should innocently take a bad half-crown of somebody else's manufacture, is reasonable enough; but that I should knowingly reckon the spurious coin of my own make, as good money! An obliging stranger, under pretence of compactly folding up my bank-notes for security's sake, abstracts the notes and gives me nutshells; but what is his sleight of hand to mine, when I fold up my own nutshells and pass them on myself as notes! (2.28.1)
The greatest act of deception in Great Expectation seems to be Pip’s self-deception.