"We may remark in passing that to be blind and beloved may, in this world where nothing is perfect, be among the most strangely exquisite forms of happiness. The supreme happiness in life is the assurance of being loved; of being loved for oneself, even in spite of oneself; and this assurance the blind man possesses. In his affliction, to be served is to be caressed. Does he lack anything? no. Possessing love he is not deprived of light. A love, moreover, that is wholly pure. There can be no blindness where there is this certainty."

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In the central cases of physical pain, then, it appears that at least part of what is bad about our condition is the way it makes us feel. Here there seem to be no problems with a purely mental state account, no counterpart to the experience machine that could bring us to think that we are being deceived by mere appearances. [...] If I am suffering physical pain then I can be quite wrong about the organic cause of my affliction, or even about whether it has one, without that error diminishing in the slightest either the reality of my pain or its impact on the quality of my life.

— L. W. Sumner