When you focus on the product, you immediately begin to fight yourself and experience boredom, restlessness, frustration, and impatience with the process. The reason for this is not hard to understand. When you focus your mind on the present moment, on the process of what you are doing right now, you are always where you want to be and where you should be.
All your energy goes into what you are doing.
However, when you focus your mind on where you want to end up, you are never where you are, and you exhaust your energy with unrelated thoughts instead of putting it into what you are doing. In order to focus on the present, we must give up, at least temporarily, our attachment to our desired goal.
If we don't give up our attachment to the goal, we cannot be in the present because we are thinking about something that hasn't occurred yet: the goal"
by Thomas M. Sterner