Self-discipline is the key to personal greatness. It is the magic quality that opens all doors for you, and makes everything else possible. With self-discipline, the average person can rise as far and as fast as his talents and intelligence can take him. But without self-discipline, a person with every blessing of background, education and opportunity will seldom rise above mediocrity.
Brian TracyNo matter how many personal productivity techniques you master, there will always be more to do than you can ever accomplish in the time you have available to you, no matter how much it is.
Brian TracyThe only thing we know about the future is that it will be faster changing and more unpredictable than the present.
Brian TracyAll the businesses from the beginning of history have struggled with product development (assuming there is a market, doing the market testing and so on). But now they start with customer development. Get the customer who says, "Yes. I want that. I need it. I wanna use it. I'll pay for it." And then you go back and work with your engineers. It is changing the world!
Brian Tracy