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For God speaketh once, yea twice, yet man perceiveth it not. In a dream, in a vision of the night, when deep sleep falleth upon men, in slumberings upon the bed; Then he openeth the ears of men, and sealeth their instruction,
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Job 33:14-16 • KJVThis passage establishes that God can communicate through dreams and visions during sleep. It suggests that dreams may carry spiritual instruction or meaning rather than being mere random thoughts.