Berkeley felt that all we really know about an object we learn from our perception of that object. He recognized that in the materialist's view the real object is independent of any perceiver's perception. The pen on my desk would exist, whether or not I was in the room to see it or have a sensory experience of it in some way. Berkeley rejected this idea. He realized that knowledge is limited to perception. In this realization, he postulated that everything we know we learned through some sort of sensory perception. He demonstrated that there was a veil of ignorance separating the materialist's real object and the perceived object. For instance, if one could not ever perceive the pen, how could one ever know of its existence? He held that if an object is independent of one's perception, then how could one know it to be real. He thought that you could not truly know something without first perceiving it in some way.
It was an easy step from that ideology for him to adopt the phrase Esse Est Percipi, which means, "To be is to be perceived." There is a crippling problem that arises in this mode of thinking that can best be demonstrated by the following limerick:
There once was a young man,
who said "God,
must find it extremely odd
to think that this tree will continue to be
when there is no one
about in the quad."
I'm always about
in the quad
and that's why
will continue to be
since observed by
This limerick demonstrates the devastating problem with this mode of thought and also a possible solution. What, then, happens to an object when no one can perceive it anymore? If no one sees the tree and no one has... [continues]
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