But if he’s the one who is fearful, which one should I be?
[1] https://www.investopedia.com/articles/investing/012116/warre...
It’s about looking at the economy, the companies, the prices. Overvalued stock is people being greedy etc.
It’s not about looking at what a specific person does.
Quite the contrary. If some professional with a track record you trust makes a call, it’s something you listen to if you’re an amateur.
As the quote alludes to, depends on what "others" are: greedy or fearful.