The market high of March 2000 was obviously a peak of insanity; less obvious but more important, it was also a peak of clarity. People looked far into the future, saw how much valuable new technology we would need to get there safely, and judged themselves capable of creating it. We still need new technology, and we may even need some 1999-style hubris and exuberance to get it.
– Zero to One, Peter Thiel.