Yes, and so learn investing by mastering the emotional discipline. The reason there are many investing mistakes is that there is no emotional discipline. If there is no emotional discipline it will lead to impulsive decision making. It includes emotions like fear, doubt, anxiety, greed, overconfidence, emotional attachment, and other such feelings. This can move you away from your investment strategy. Selling stocks or redeeming mutual funds when the market falls, is an example of lack of emotional discipline. This normally results in losses.