It is far more difficult... to know when to sell a stock than when to buy.
Society can progress if men's labors show a profit - if they yield more than is put in. To produce at a loss must leave less for all to share.
Don't try to buy at the bottom and sell at the top. It can't be done except by liars.
Never follow the crowd.
We grow neither better or worse as we get old, but more like ourselves.
Colleges don't teach economics properly. Unfortunately we learn little from the experience of the past. An economist must know, besides his subject, ethics, logic, philosophy, the humanities and sociology, in fact everything that is part of how we live and react to one another.