If you are having a great day, you owe it to others to pass that blessing you have by helping others to have a great day too. If you are having a bad day, allow someone to have a great day by allowing them to help you. If you are having a horrible day, help someone and at least you allow someone else to have a better day which brings value to your day that you may think is not valuable ... but it will now be valuable.
Lord, thank You for the opportunity to serve others, whether I am in the position to do so or whether I choose to be in the position to do so.