If you have ever been wondering that why traders lose money; than we have the answer from legendary trader cum investor Jesse Livermore whose reasoning is as appended below:
"The reason is that a man may see straight and clearly and yet become impatient or doubtful when the market takes its time about doing as he figured it must do. That is why so many men in Wall Street, who are not at all in the sucker class, not even in the third grade, nevertheless lose money. The market does not beat them. They beat themselves, because though they have brains they cannot sit tight."
The above quote has a lot of relevance and one has to read between the fine print to understand the meaning.