Slight modification to this rule as there are three classifications you have to accept: - Things you control - If you put your phone in a protective case - Things you can influence - Case design, you influence case design by selecting a design you find best - Things you can't control - The fact that you're eventually going to drop the phone
This helps for lot's of scenarios, for example fear of flying - unless you're a trained pilot there isn't much you can do to prevent the airplane from crashing. You might be able the influence the odds of surviving by helping the pilot, but that's about it. Your control of the situation was released the moment the airplane left the ground. Accepting this can help with the stress of life.
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