Venturesome schemes are, like good steel, forged in fire and then hardened in ice
It is necessary here to insist once more that in Magellan audacity, boldness, invariably assumed a peculiar complexion. To act boldly did not, in his case, mean to act on the heat of impulse, but to lay his plans craftily, to do the dangerous thing with the utmost caution and after most careful calculation. His most venturesome schemes were, like good steel, forged in fire and then hardened in ice. It was by this mixture of imagination and caution that, again and again, he triumphed in moments of danger. His plan was instantly formed, and the brief time before it was to be put into execution served merely to perfect the details.
First Aron interviewed thirty-nine people who described themselves as being either introverted or easily overwhelmed by stimulation. She asked them ...
[Steve jobs, 1981, pitching the first Macintosh]
This is a 21st century bicycle for your mind
As ever, the accountant in me saw the risk, the entrepreneur saw the possibility.
Their defining quality is probably that they really love to program. Ordinary programmers write code to pay the bills. Great hackers think of it as something they do for fun, and which they're delighted to find people will pay them for. Great programmers are sometimes said to be indifferent to money. This isn't quite true.