In his own words · Patience
“If you buy a business just because it's undervalued, then you have to worry about selling it when it reaches its intrinsic value. That's hard. But if you can buy a few great companies, then you can sit on your ass. That's a good thing.”
— Charlie Munger · Berkshire Hathaway annual meeting, 2000 · 2000
As recalled from Berkshire Hathaway annual meeting, 2000 · 2000 — the sense is right but the wording is not verbatim.
Munger's 'sit on your ass investing' concept. The catchphrase is verifiably his (reaffirmed in his 2023 CNBC interview); this longer wording is the commonly circulated version.