"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"

"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 https://en.m.wikipedia.org/wiki/Franz_Reichelt