If markets were truly efficient, then you shouldn't be able to make any money rebalancing. - William J. Bernstein

The rub here is that buying when prices are low is always a very scary proposition. The low prices that produce high future returns are not possible without catastrophe and risk.

when a famous investor publishes a newsletter, it's a sure tip-off that his techniques have stopped working.

At a very early stage in history we are encountering "survivorship bias" - the fact that only the best results tend to show up in the history books.