A very powerful question to ask in relation to life all the way down to the finer moment by moment situations. Does it matter? It is the subject at focus that can include bigger picture life topics or smaller task focused. Will all this matter at the end of your life?
The answers and thoughts that are raised from this question will help you in your effectiveness in life. How? Think about what you are doing in life today. What is your main occupation or life objective and why? What is its purpose and does it matter? When you get to the end of your days why does it matter?