I do a LOT of non-fiction reading.  I love reading the biographies of entrepreneurs and leaders.  And naturally you start to see recurring themes in their message.  One very subtle theme that crops up again and again is how the super-successful feel fulfilled. It seems that at some stage in their career, it isn't enough to make more and more money or gain growing market share.  Almost without exception there comes a time when the most fulfilling thing an entrepreneur can do is to start giving back.  Buffett, Gates, Branson - they all plough millions or even billions back into good causes.  It brings a renewed sense of purpose.  It helps contribute to your "why".