Try to look for weaknesses in your thinking.
You have to be a little aware of the emotions of the people who have invested with you.
My first job at Graham-Newman was to prepare the annual report for that 10th year.
I helped Ben with the third edition of Security Analysis, published in 1951.
Don't buy on tips or for a quick move.
If you are honest, hardworking, reasonably intelligent and have good common sense, you can do well in the investment field as long as you are not too greedy and don't get too emotional when things go against you.