The first is a blog post from Mark Cuban, talking about how in business you only have to be successful once and that's reason enough to never give up trying. You can read it here.
The second is from Jeffrey Fox's book, "How To Make Big Money In Your Own Small Business", and talks about how some people think that success or being great at something always looks like it comes easy to that person. In particular Jeffrey talks about the baseball superstar, Ted Williams and how he was asked
"how come hitting a baseball came so easily to him. 'Simple,' answered Ted Williams. 'I take a thousand swings a day.' Ted Williams went to batting practice, to the locker room, to his kitchen, to his bedroom swinging real and imaginary bats. He took 1,000 swings a day. Ted's 1000 swings were probably 900 swings more than anyone else. And 1,000 swings a day is why hitting "came easy" to the great Ted Williams."