They were governed by private loyalties which they did not question. What mattered were individual relationships, and a completely helpless gesture, an embrace, a tear, a word spoken to a dying man, could have value in itself. The proles, it suddenly occurred to him, had remained in this condition. They were not loyal to a party or a country or an idea, they were loyal to one another. […] The proles had stayed human. They had not become hardened inside. They had held on to the primitive emotions which he himself had to relearn by conscious effort. […]

With all their cleverness they had never mastered the secret of finding out what another human being was thinking. […] Facts, at any rate, could not be kept hidden. They could be tracked down by inquiry, they could be squeezed out of you by torture. But if the object was not to stay alive but to stay human, what difference did it ultimately make? They could not alter your feelings; for that matter you could not alter them yourself, even if you wanted to. They could lay bare in the utmost detail everything that you had done or said or thought; but the inner heart, whose workings were mysterious even to yourself, remained impregnable.

— 1984 by George Orwell