Anger, if not obeyed, fades; once it enters the mind and pervades habit, vice becomes law.
Ira, nisi paret, facit moram: si semel intraverit mentem morumque pervaserit, lex est quod antea vitium fuit.

Philosophers
Seneca
Seneca (c. 4 BC - 65 AD), Stoic philosopher and Nero's advisor, wrote on time, anger, and adversity from the heart of Roman power. His Moral Letters and On the Shortness of Life remain practical self-mastery guides.
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Seneca's Other Quotes
It is not that we have a short time to live, but that we waste much of it.
Fire tests gold; adversity tests strong people.
As in all things, we suffer from excess in reading too. Many books are a burden, not an ornament.
It is the quality of your life that matters, not its length.
It is hard to retain what you learn unless you practice it.
Related Quotes
The key to making money in stocks is not to get scared out of them.
-- Peter Lynch
Everyone has the brainpower to make money in stocks. Not everyone has the stomach.
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It is not things that disturb us, but our judgments about things.
-- Epictetus
Hostility, anger, and rage are best understood as derivatives of an underlying perception of threat or transgression.
-- Aaron Beck