Wall Street people learn nothing and forget everything.
Benjamin Graham - Learning - Stock Market - Investing

Most of the time common stocks are subject to irrational and excessive price fluctuations in both directions as the consequence of the ingrained tendency of most people to speculate or gamble... to give way to hope, fear and greed.
Benjamin Graham - Stock Market - Investing - Greed - Fear

The individual investor should act consistently as an investor and not as a speculator. This means.. that he should be able to justify every purchase he makes and each price he pays by impersonal, objective reasoning that satisfies him that he is getting more than his money's worth for his purchase.
Benjamin Graham - Investing - Stocks - Money

I am no longer an advocate of elaborate techniques of security analysis in order to find superior value opportunities.
Benjamin Graham - Investing - Stocks - Opportunity