Will Smith explains how important is to focus fully on what you CAN and WILL do; in his opinion, there cannot be another option. Yes it is difficult but you have to realize that you must be willing to do anything for what you are trying to accomplish.
He explains the laws of attraction and manifestations. Everything happens for a reason; a good opportunity may present itself when you least expect it and that's when you need to reach out and grab it.
Success only depends on you and how much effort you put on something to accomplish it.