thank you so much for your help it really means a lot
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His discovery is noted in the previous sentence, as he realizes that he and Julia has become numb to the reality around them; they'd become hardened and uncaring. The Proles were still human because they had feeling; they had families, and they knew what it was to feel and act on their emotions.
Sorry, I meant to give you the passage;
"The proles had stayed human. They had not become hardened inside. They had held on to the primitive emotions which he himself had to re-learn by conscious effort. And in thinking this he remembered, without apparent relevance, how a few weeks ago he had seen a severed hand lying on the pavement and had kicked it into the gutter as though it had been a cabbage-stalk."