"I'm not going to take this defeatist attitude and listen to all this crap any more from all these people who have nothing except doomsday to predict"

Carroll Shelby's quote is a call to action. He is declining the concept of succumbing to defeat and listening to those who just have unfavorable things to state. He is motivating people to decide and not be prevented by the pessimism of others. He is recommending that rather of listening to those who just have negative things to state, individuals must focus on the favorable and take action to make their dreams a truth. He is also suggesting that people ought to not hesitate to take threats and try new things, even if they might stop working. By doing this, people can create a better future on their own and those around them. Shelby's quote is a tip that we must not hesitate to take dangers and strive for success, even if it indicates going versus the grain.