Great Expectations - Question about a Passage - Week 15

"Pip, dear old chap, life is made of ever so many partings welded together, as I may say, and one's a whitesmith and one's a goldsmith, and one's a coppersmith. Diwisions among such must come, and must be mine. You and me is not two figures to be together in London; nor yet anywheres else but what is private, and beknown , and understood among friends, It ain't that I am proud, but that I want to be right , as you shall never see me no more in these clothes." (239) chapter 27. Here I assume that Joe is making an analogy about blacksmiths and social class. With Joe being a blacksmith and Pip a goldsmith, but after that, Joe's wording and slurred speech is a little to much for my sleep deprived brain to comprehend If anyone could tell me what Joe is trying to say to Pip when he talks about them in London, both my mind and body would greatly appreciate it.