In his own words · Money & fees
“It is one thing each year to pay the croupiers 3% of starting wealth when the average foundation is enjoying a real return, say, of 17% before the croupiers' take. But it is not written in the stars that foundations will always gain 17% gross, a common result in recent years.”
— Charlie Munger · "Investment Practices of Leading Charitable Foundations," speech to the Foundation Financial Officers Group, Santa Monica, CA, October 14, 1998 · 1998
Verified. Sourced to "Investment Practices of Leading Charitable Foundations," speech to the Foundation Financial Officers Group, Santa Monica, CA, October 14, 1998 · 1998.
The punchy 'It is one thing… it is quite another' version circulated online is fabricated; this is the authentic passage.