1) A stock is a piece of a business. If you don't want to own the business don't buy the stock
2) Market is there to serve you not to instruct.
The market is a psychotic, drunk, manic depressive selling 4,000 companies everyday. "If you buy a farm, you look to the farm to determine the value of your interest, not to some guy coming by giving you a quote everyday."
3) Know your "Margin of Safety" with every investment.