We become what we think about.
The very thoughts we conjure and dwell upon shape our actions, habits, character, and destiny. Choose your thoughts wisely. Knowing this, recognize how important your environment is. The people you hang out with, the hobbies and pastimes you indulge in, the imagery you subject yourself to, what you read, what you listen to, and the desires of the heart all shape you variably. Control your thoughts and you control your life, your success or your failure.
I think, therefore I am.