The right thinking and wrong thinking with regard to investment

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One common wrong thinking is focusing on the market price, expecting to profit from the market price changes. This is wrong because it is very uncertain and risky to time the market price changes. With such a thinking, you are not an investor, but a speculator. Sooner or later, the uncertainty will ruin your portfolio performance.
The right thinking should focus on the sure things, for example, such as the dividends and the business growth. The rule of thumb for avoiding uncertainty is to only invest in high dividends stocks. If the dividend pay out ratio is 20% or more annually, then you could receive your principles back in about 5 years, just sitting tight. Additional bonus, if the market and business trend is your friend, then you probably can get back your principles much faster.
So never buy a stock without a nice dividend pay out history and perspective.