The Seal of Prophets, Sayyidina Muhammad, peace be upon him, imparted this good advice to mankind: "If you awaken in the morning and find that you are lacking nothing in the way of material sustenance, and that you and your family are in good health, then don't burden yourself with worry".
Allah Almighty doesn't want His servants to suffer needless self-inflicted misery, and He says: "Oh My servants, don't load heavy burdens on yourselves by worrying about the future. Just bring yourselves in line with My will; accord with my purposes this moment, and then rest assured that I will help you keep your future moments similarly aligned with My will".