In this incisive and timely essay on balancing professional values and business values in the world of investing and finance, John C. Bogle, founder of both The Vanguard Group and the first index mutual fund, offers concise and useful guidance to practitioners seeking ways to cope with the extraordinary changes in society, technology, and market forces of the past few decades. Drawing on lessons learned over his distinguished 65-year career, Mr. Bogle bases his sage and prudent advice on not only his own vast experience but also the time-tested wisdom of both Adam Smith, the 18th-century Scottish economist-philosopher, and Benjamin Graham, a legendary pioneer in our profession.