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by devinplatt 704 days ago
"Confidence is belief in yourself. Certainty is belief in your beliefs. Confidence is a bridge. Certainty is a barricade." - Kevin Ashton, "How To Fly A Horse"

As I recall that book used the example of Franz Reichelt, who "is remembered for jumping to his death from the Eiffel Tower while testing a wearable parachute of his own design" https://en.m.wikipedia.org/wiki/Franz_Reichelt