I always say, to have a big dream requires the same effort as having a small dream. Dream big!
I have learned that the ethics of the so-called markets can be different from what we learn at school. In day-to-day life you have stimulus to behave unethically, but in the long term it always pays off to be ethical.
The three short years I spent at Harvard, where I lived with excellent people, taught me not only that I must know how to choose my partners but also that choosing excellent partners is a skill you can learn. Obviously, when you spend time with the best, you learn how to choose among them.