Each human being has been granted a virtue: the capacity to choose. For he who does not use this virtue, it becomes a curse - and others will always choose for him.
Keep a grateful journal. Every night, list five things that happened this day that you are grateful for. What it will begin to do is change your perspective of your day and your life. If you can learn to focus on what you have, you will always see that the universe is abundant; you will have more. If you concentrate on what you don't have, you will never have enough.
The best things are nearest: breath in your nostrils, light in your eyes, flowers at your feet, duties at your hand, the path of God just before you. Then do not grasp at the stars, but do life's plain common work as it comes certain that daily duties and daily bread are the sweetest things of life.