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In Europe I told the philosophers and scientists of materialism that the criterion of the senses is not reliable. For instance, consider a mirror and the images reflected in it. These images have no actual corporeal existence. Yet if you had never seen a mirror you would firmly insist and believe that they were real. The eye sees a mirage upon the desert as a lake of water but there is no reality in it. As we stand upon the deck of a steamer the shore appears to be moving, yet we know the land is stationary and we are moving. The earth was believed to be fixed and the sun revolving about it but although this appears to be so, the reverse is now known to be true. A whirling torch makes a circle of fire appear before the eye, yet we realize there is but one point of light. We behold a shadow moving upon the ground but it has no material existence, no substance. In deserts the atmospheric effects are particularly productive of illusions which deceive the eye. Once I saw a mirage in which a whole caravan appeared traveling upward into the sky. In the far north other deceptive phenomena appear and baffle human vision. Sometimes three or four suns called by scientists "mock suns" will be shining at the same time whereas we know the great solar orb is one and that it remains fixed and single. In brief, the senses are continually deceived and we are unable to separate that which is reality from that which is not.
(45:2)
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