Mr. Farrell, Merrill Lynch’s chief market strategist from 1967-1992 penned some pretty decent “Rules to Remember”…

1) Markets tend to return to the mean over time.
2) Excesses in one direction will lead to an opposite excess in the 
other direction.
3) There are no new eras – excesses are never permanent.
4) Exponential rapidly rising or falling markets usually go further 
than you think, but they do not correct by going sideways.
5) The public buys the most at the top and the least at the bottom.
6) Fear and greed are stronger than long-term resolve.
7) Markets are strongest when they are broad and weakest when 
they narrow to a handful of blue chip names.
8) Bear markets have three stages – sharp down – reflexive rebound – 
a drawn-out fundamental downtrend.
9) When all the experts and forecasts agree – something else is going 
to happen.
10) Bull markets are more fun than bear markets