Complexity theory

"If the world were so simple 

That we could understand it

Then we would be so simple

That we couldn't"

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I don't think I really wrote the above lines.  I think I must have read them, or something very much like them, years ago.  I do like the sentiment, though, and the unusual construction of the phrases.

If anyone knows the true original source, I would appreciate the reference.

Don't you agree that the world is so complicated?  How does one know for sure, for example, whether or not it is healthy to eat Gulf shellfish?  I doubt that there is any way to know for sure.