You will always have bills to pay, milk to buy, and dogs to feed. Rather than allow your happiness and peace of mind be conditioned on the completion of these tasks, try to be at peace knowing that you will always have a to-do list until the day you die. There will always be something that needs to get done. Be at peace with that reality. Celebrate that reality. It means you are alive, the world is moving, and you are still growing. Practice peace in light of the fact that your to-do list will never be finite. Try to catch yourself thinking that you will finally be happy when X is done and out of the way. Find peace in acknowledging that after you do X there will be Y, and so on. Once we realize that our work never ends we can focus on being at peace during the work, embracing the list, and enjoying the little things.