From Charlie Munger: The Complete Investor (which according to Amazon, is now being shipped for end-of-week deliveries):
No one can know everything, but you can work to understand the big important models in each discipline at a basic level so they can collectively add value in a decision-making process. Simply put, Munger believes that people who think very broadly and understand many different models from many different disciplines make better decisions and are therefore better investors.
Recently on the Charlie channel:
"Thought of the day" Munger Edition
"Charlie Munger on “Loading Up,” Tracking Error, and Value Investing"
"Charlie Munger on how he invested when younger compared to today, and how he reads books"
Charlie Munger on Ernst & Young: Something About Fishing Around in the Groin