Paulo Coelho
I love this quote.

The boy didn't know what a 'Personal Legend' was. "It's what you have always wanted to accomplish. Everyone, when they are young, knows what their Personal Legend is.
At that point in their lives, everything is clear and anything is possible. They are not afraid to dream, and yearn for everything they would like to see happen to them in their lives. But as time passes, a mysterious force begins to convince them that it will be impossible for them to realize their Personal Legend." None of what the old man was saying made much sense to the boy. But he wanted to know what the "mysterious force" was; the merchants daughter would be impressed when he told her about that. "It's a force that appears to be negative, but actually shows you how to realize your Personal Legend. It prepares your spirit and your will, because there is one great truth on this planet: whoever you are, or whatever it is that you do, when you really want something it's because that desire originated in the soul of the Universe. It's your mission on Earth." "Even when all you want is to travel? Or marry the daughter or a textile merchant?" "Yes, or even search for treasure. The Soul of the World is nourished by people's happiness. And also by unhappiness, envy, and jealousy. To realize one's Personal Legend is a person's only real obligation. All things are one. And, when you want something, all the Universe conspires in helping you to achive it."