The individual investor should act consistently as an investor and not as a speculator.

Investors
Benjamin Graham
Benjamin Graham (1894-1976), the father of value investing, wrote Security Analysis and The Intelligent Investor. His margin-of-safety and Mr. Market concepts shaped Buffett and generations of disciplined investors.
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Benjamin Graham's Other Quotes
In the short run, the market is a voting machine but in the long run, it is a weighing machine.
The investor's chief problem — and even his worst enemy — is likely to be himself.
The margin of safety is always dependent on the price paid.
An investment operation is one which, upon thorough analysis, promises safety of principal and an adequate return. Operations not meeting these requirements are speculative.
Have the courage of your knowledge and experience. If you have formed a conclusion from the facts and if you know your judgment is sound, act on it — even though others may hesitate or differ.