What’s the other aphorism?
“You can’t remain solvent longer than the market can remain irrational”
The best way for an individual to succeed is to not be overly greedy and take profits off the table as you go along.
I don't see how that one applies to me at all. I don't buy or sell on margin, and I don't place bets on the direction of the market with money that I might need in the foreseeable future.