"The problems of philosophy and the systems designed to solve them are formulated in terms which tend to refer, not to the realm of actuality, but to the realms of possibility and necessity: to what might be and what must be, rather than to what is."

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I recognise a distinction between dream life and real life, between appearances and actualities. I confess to an over-powering desire to know whether I am asleep or awake--whether the environment and laws which affect me are external and permanent, or the transitory products of my own brain.

— H. P. Lovecraft