“Nothing is in the mind which was not first in the senses, except the mind itself.”
— Gottfried Wilhelm Leibniz
Simplified Meaning:
Our thoughts and ideas come from what we experience through our senses like seeing, hearing, touching, tasting, and smelling. For example, we know what an apple looks like because we have seen and touched apples before. Our brains process these sensory experiences and turn them into memories or thoughts. Someone can't think about or understand something they've never sensed in any way. But the brain itself can think and imagine new things by combining these sensory experiences in new ways. So, everything we know or imagine starts with something we have sensed at some point.
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