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"Her father was a country gentleman down in your part of the world, and was a brewer. I don't know why it should be a crack thing to be a brewer; but it is indisputable that while you can't possibly be genteel and bake, you may be as genteel as never was and brew. You see it every day." (22.42)
Huh. So, you can use yeast to make beer and still be considered a gentleman, but you can't use yeast to make bread and be considered a gentleman? With rules like that, no wonder Pip constantly feels lost.