According to Jesse Livermore, who is considered one of the best traders of the early 1900s, there are 4 mental characteristics that one needs in order to be a superior market trader.
1. Observation - observe facts without bias
2. Memory - remember important events and be objectively
3. Mathematics - know how to run numbers
4. Experience - retain and learn from your trading experience
- Jesse Livermore (How To Trade In Stocks)