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Many a time of an evening, when I sat alone looking at the fire, I thought, after all, there was no fire like the forge fire and the kitchen fire at home. (2.34.1)
Pip’s home is closely associated with warmth and fire, particularly because Joe’s forge adjoins his house. In this way, the cold marsh country actually seems warmer than dreary and stormy London. Joe’s forge seems to emphasize the warmth that Joe naturally exudes.