"Let us not take ourselves too seriously. None of us has a monopoly on wisdom."
- Queen Elizabeth
1. Common sense is not so common.
2. Greed often overcomes common sense.
3. Greed kills.
4. Fear and greed are stronger than long term resolve.
5. There is no vaccine for being overleveraged.
6. When you combine ignorance and leverage - you usually get some pretty scary results.
7. Operate only in your area of competence.
8. There is always more than one cockroach.
9. Stocks have a gravitational pull higher - over long periods of time equities will rise in value.
10. Long investing generates wealth.
11. Short selling protects wealth.
12. Be patient and learn how to sit on your hands.
13. Try to get a little smarter every day and read as much as humanly possible - an investment in knowledge pays the best dividends.
14. Investors sometime think too little and calculate too much.
15. Read and reread Security Analysis (1934) by Graham and Dodd - it is the most important book on investing ever published.
16. History is a great teacher.
17. History rhymes.
18. What we have learned from history is that we haven't learned from history.
19. Investment wisdom is always 20/20 when viewed in the rear view mirror.
20. Avoid "first level thinking" and embrace "second level thinking."
21. Think for yourself - as those who can make you believe absurdities, can make you commit atrocities.
22. In investing, that what is comfortable - especially at the beginning - is most often not exceedingly profitable at the end.
23. Avoid the odor of "group stink" - mimicking the herd and the crowd's folly invite mediocrity.
24. The more often a stupidity is repeated, the more it gets the appearance of wisdom.
25. Always have more questions than answers.
26. To be a successful investor you must have accounting/finance knowledge, you must work hard and you have to be keenly competitive.
27. The stock market is filled with individuals who know the price of everything but the value of nothing.
28. Directional call buying, when consumed as a steady appetite, is a "mug's game" and is often a path to the poorhouse.
29. Never buy the stock of a company whose CEO wears more jewelry than your mother, wife, girlfriend or sister.
30. Avoid "the noise."
31. Reversion to the mean is a strong market influence.
32. On markets and individual equities... when you reach "station success," get off!
33. Low stock prices are the ally of the rational buyer - high stock prices are the enemy of the rational buyer.
34. Being right or wrong is not as important as how much you make when you are right and how much you lose when you are wrong.
35. Too much of a good thing can be wonderful - look for compelling ideas and when you have conviction go ahead and overweight bigly.
36. New paradigms are a rare occurrence.
37. Pride goes before fall.
38. Consider opposing investment views and cultivate curiosity.
39. Maintain a healthy level of skepticism as you never know when the Cossacks might be approaching.
40. Though doubt is uncomfortable, certainty is ridiculous and sometimes dangerous.
41. When investing and trading, never let your mind dwell on personal problems and always control your emotions.
42. 'Rate of change' is the most important statistic in investing.
43. In evaluating the attractiveness of a stock always consider upside reward vs. downside risk and 'margin of safety.'
44. Don't stray from your investing and trading methodologies and timeframes.
45. "Know" what you own.
46. Immediately sell a stock on the announcement or discovery of an accounting irregularity.
47. Always follow the cash (flow).
48. When new ways of earnings are developed - like EBITDA (and before stock based compensation) - substitute them with the word... "bullshit."
49. Favor pouring over balance sheets and income statements than spending time on Twitter and r/wallstreetbets.
50. Always pay attention to what David Tepper and Stanley Druckenmiller are thinking/doing. (Trade/invest against them, at your own risk).
(This commentary originally appeared on Real Money Pro on April 22. Click here to learn about this dynamic market information service for active traders and to receive Doug Kass's Daily Diary and columns from Paul Price, Bret Jensen and others.)