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“If you are depressed you are living in the past. If you are anxious you are living in the future. If you are at peace you are living in the present.”
People who think they can be the best at everything all the time are either young, delusional, liars, or doomed for narrow boring careers.
The punchline is you have to pick and choose when to be the absolute best. And in between, you should optimize, be efficient, and satisfice.