It made Marcus Aurelius better and Seneca worse when he was asked by Nero’s mother to assist his son and he kept a blind eye from Nero’s atrocities.
So, success is perhaps not for everyone. Seneca somehow lost his authenticity and his sincerity when he became a consultant. Success should not alter the true self unless the self wasn’t that true to start with.
This is a well written article about the difference of success reception in stoicism, a comparison of Marcus Aurelius and Seneca.
You can read it by clicking on the link below: