
You've probably all heard the illustration: Several blind men feel an elephant at different spots and each proclaim that the elephant is either thin, or thick, or sharp, or wide, or flexible depending on where each one is feeling. They begin to contend with each other about which is right and which is wrong, until you as the observer realize that they're all right and they're all wrong. They are all correct in their evaluation of that one part, but because no one can see the entire elephant, they can't claim that the whole beast is the same all the way around.
The point is then constructed that no one can claim they have the whole truth. Everyone grasps part. Basically, don't try to push your views on others because everyone has just part of spiritual reality, and you're no more right than they are.
The problem with this example is that you can't possibly tell the story about the blind men unless you see the whole elephant. The teller is inadvertently telling us he sees the whole picture, which ironically, is the very thing he is saying no body has! In all reality, he's claiming he has a superior mindset and is trying to convert everyone else to his view. As Keller says, when you say no one has a take on spiritual reality, that IS a take on spiritual reality, which you say is above every one else's.
So next time you encounter the Blind Men and Elephant illustration, remember, it's really just as religious as any claim it is trying to relativize.
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Sources:
Tim Keller, Exclusivity: How can there be just one true religion?
Lesslie Newbigin, The Gospel in a Pluralist Society