One of the things that helped me to make up my mind about the uselessness of “worry” was… a joke. (What else is new, right?)
There Is Nothing To Worry About
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Either you are healthy, or you are sick. If you are healthy, then you have nothing to worry about.
If you are sick, then your disease will kill you or it won’t. If your current malaise won’t kill you, then you have nothing to worry about.
If you have a terminal illness, then you’re either going to die “sooner” or “later”. If you’re not going to die for a long time, then you have nothing to worry about.
If you’re going to die soon, then the choices left are that you will die peacefully, or in pain. If you’re going to die peacefully, and soon, then obviously you have nothing to worry about.
If you’re going to die in pain soon, then your only worry is “how soon” and “how much pain” and “can I end it sooner, and on my own terms?” If you can end your life quickly, then you have nothing to worry about.
If you’re going to die painfully, soon, and can do nothing about it, then you already know that worry is the least of your worries.
Live long and prosper.