Expecting the best means that you put your whole heart (i.e., the central essence of your personality) into what you want to accomplish. People are defeated in life not because iof lack of ability, but for lack of whole-heartedness. They do not whole-heartedly expect to succeed. Their heart isn't in it, which is to say they themselves are not fully given. Results do not yoeld themselves to the person who refuses to give himself to the desired results.
A major key to success in this life, at attaining that which you deeply desire, is to be completely released and throw all there is of yourself into your job or any project in which you are engaged. In other words, whatever you are doing, give it all you've got. Give every bit of yourself. Hold nothing back. Life cannot deny itself to the person who gives life his all. But most people, unfortunately, don't do that. In fact, very few people do, and this is a tragic cause of failure, or, if not failure, it is the reason we only half attain.
Each one of us is blessed with plethora of talents and abilities. The irony lies in the fact that we are unaware of our abilities. It is only us who can explore our ability. We all have come to the earth with particular talents and abilities. These provide us sustenance on the earth which is equally essential for the benefit of others, as well, leaving a heritage for our children to continue on, and a bequest from which others may also be benefitted.
We all have a particular part to play during the time spent on the earth - whether it's related to the environment, nature, humanity. In case we do not execute our part i.e. use our flairs and abilities for the benefit of ourselves and others, we are for sure depriving ourselves and others of those possessions that are within us. As a result, we feel emptiness in our lives.
Almighty has sent each one of us with a special purpose. He has also bestowed us with immense reservoir of abilities. Therefore, we must appreciate the assortment of talents, abilities and persona in ourselves to fulfill our sole purpose of living.