Emotions must be controlled properly because otherwise it will be very dangerous.. Trading failures are usually caused by trivial things, namely we don't want to control emotions, we often underestimate them.. For example, with ops using 0.10 lots even though it was floating minus but the account was still very low. safe.. but because of the ambition to want a big profit, finally open a position of 1 lot in the direction of the market because I hope the market direction remains opposite to the initial op, it turns out that in the end the market turns around and is in the direction of the initial OP. so in the end confused himself and ended up mc. In fact, if you had only used 0.10 lots without opening a new position with a large lot, you would certainly get enough profit.
That's an example of not being able to control ambition and emotions, the way of trading is greedy in the end, which should be profitable, instead becomes pregnant... so emotions must always be controlled in every trading activity and don't forget to be patient and stay disciplined with the rules in concept.