5 ideas
After Athens's catastrophic defeat in Sicily, a barber in the Piraeus heard the news from a runaway slave and rushed into the city to spread it before anyone else. Unable to name his source, he was taken for a rumor-monger and put on the torture wheel. When official messengers confirmed the disaster and he was released, his first question was whether they had heard how the general Nicias had died.
The chatterer talks to be heard and believed, but constant talk makes listeners stop attending and stop trusting. So the vice defeats its own aim, and the talker ends up isolated in company. Silence has the reverse effect: a person known to hold their tongue is sought out and credited when they do speak.
A vice is a habit, so its cure is a counter-habit built through small, low-stakes practice. Examples include walking past a tomb without reading its inscription, letting others answer questions not put to you, and delaying opening a letter. A person who has practiced these minor refusals can use that restraint when a serious impulse arrives.
An enemy watches your conduct more closely than any friend and eagerly exposes your faults. Treat that scrutiny as a service: it forces you to live carefully and points out flaws that friends excuse. The best revenge on an enemy is to become someone they can find nothing against.
Meddling curiosity is a real appetite for knowing things, pointed at the wrong object: other people's hidden troubles. Do not starve the appetite. Turn it inward toward your own faults, or outward toward nature, history, and science, which offer endless secrets that harm no one when uncovered.