what does David mean by the last paragraph of the chapter？
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David means that John and Mary might understand him better if they knew his thoughts and were aware of his circumstances. They might also not have been so concerned.
If John and Mary Wender had been there when I woke up struggling and crying, and then lay in the dark trying to convince myself that the terrible picture was nothing more than a dream, they would, I think, have felt quite a lot easier in their minds.