There are many talented people who haven't fulfilled their dreams because they over thought it, or they were too cautious, and were unwilling to make the leap of faith.
“There are domains in which expertise is not possible. Stock picking is a good example. And in long-term political strategic forecasting, it's been shown that experts are just not better than a dice-throwing monkey.”
“In the early 1930s, flying from England to Australia was the longest flight in the world. It was considered extremely dangerous and hazardous, pushing pilots to the limits of mechanical skills and human endurance. Aviation was young.”