"I don't know whether you can look at your past and find, woven like the hidden symbols on a treasure map, the path that will point to your final destination."

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The GPS unit became almost equally obstreperous, though, over Richard’s unauthorized route change, until they finally passed over some invisible cybernetic watershed between two possible ways of getting to their destination, and it changed its fickle little mind and began calmly telling him which way to proceed as if this had been its idea all along.

— Neal Stephenson