“Successful people never worry about what others are doing.”

— Plato

Alleged source in Plato unknown. Earliest occurrence to have been located is a Tweet from 2011 https://twitter.com/ochocinco/status/93332058864238592.
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Plato 80

Classical Greek philosopher -427–-347 BC

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As quoted in Dictionary of Thoughts (1908) by Tryon Edwards, p. 22.
Decade unclear
Variant: Do not anticipate trouble, or worry about what may never happen. Keep in the sunlight.