Equanimity.
Aequanimitas.

Politicians
Antoninus Pius
15th Roman emperor (86-161), fourth of the Nerva-Antonine dynasty and third of the Five Good Emperors. Adopted by Hadrian and elevated in 138, he ruled for 23 years without leaving Italy, presiding over the most peaceful stretch of the Principate. He earned the title Pius for securing Hadrian's deification and for codifying important principles of Roman law including the presumption of innocence. His reign also drew later criticism for failing to wage preventive wars on the eastern and German frontiers.
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Antoninus Pius's Other Quotes
Related Quotes
It is not that we have a short time to live, but that we waste much of it.
-- Seneca
Everything depends on your judgment, and that judgment rests with you.
-- Marcus Aurelius
This mind is luminous — what more is there to say?
-- Wang Yangming
The play is over; applaud.
-- Augustus
We have gained an empire and lost even what we had before.
-- Antoninus Pius
I am dying, Egypt, dying.
-- Mark Antony