80/20 Rule

20% of your activities produce 80% of your results for ALL areas of your life. The key is knowing what those 20% activities are for you, scheduling those into your calendar while you are not spinning your wheels on the 80% of activities that only produce 20% of the results. One of the best resources in the world for this topic is one of my favorite books of all time: 80/20 Sales and Marketing: The Definitive Guide to Working Less and Making More by Perry Marshall