We may even go so far as to say that whatever dreams may offer, they derive their material from reality and from the intellectual life that revolves around that reality. . . . Whatever strange results they may achieve, they can never in fact get free from the real world; and their most sublime as well as their most ridiculous structures must always borrow their basic material either from what has passed before our eyes in the world of the senses or from what has already found a place somewhere in the course of our waking thoughts—in other words from what we have already experienced either
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