Energy
You are only able to produce so much energy in a given day. If you were to focus that energy on one single task you would make more progress on that task then if you focused your energy on ten tasks. This is why Steve Jobs wore the same thing each day as it limited the amount of energy he needed to spend on deciding what to wear. Sounds extreme right? That's because it is.
What about in your life? Are you extreme about how and where you spend your time/energy? Are you focusing your energy on a single initiative or are you diluting your energy amongst multiple initiatives? I once heard you can use the power of the sun to get a sun tan or you can focus the power of the sun and turn it into a laser beam that cuts through steal.
We all have a limited amount of energy to accomplish the things we want to in life. The key is to remove distractions including those things that are not worth our time and energy so we can focus on that which is most important.
Maybe it's time to invest into some black turtlenecks...