“If our dreams were more regular, more connected, more stable, they would also have more practical importance for us.”
Other Ernst Mach Quotes
The fact is, every thinker, every philosopher, the moment he is forced to abandon his one-sided intellectual occupation by practical necessity, immediately returns to the general point of view of mankind.
Ernst Mach 
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A movement that we will to execute is never more than a represented movement, and appears in a different domain from that of the executed movement, which always takes place when the image is vivid enough.
Ernst Mach
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Bodies do not produce sensations, but complexes of elements (complexes of sensations) make up bodies.
Ernst Mach
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