Warren Buffett Quotes about Past

it's a good idea to review past mistakes before committing new ones.
Warren Buffett (2009). “Warren Buffett on Business: Principles from the Sage of Omaha”, p.149, John Wiley & Sons
Warren Buffett's 2010 annual letter to the shareholders of his holding company, Berkshire Hathaway, February 26, 2011.
Berkshire Hathaway Inc. Chairman's Letter, 1998.