If you are distressed by anything external the pain is not due to the thing itself but to your own estimate of it and this you have the power to revoke at any moment.
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About Marcus Aurelius
Marcus Aurelius was Roman emperor from 161 to 180. Marcus Aurelius Antoninus was Roman emperor from 161 to 180 and a Stoic philosopher. He was a member of the Nerva–Antonine dynasty, the last of the rulers later known as the Five Good Emperors and the last emperor of the Pax Romana, an age of relative peace, calm, and stability for the Roman Empire lasting from 27 BC to 180 AD. Read more on Wikipedia →