Self-discipline and control would be one thing that cannot be taught by anyone because if the person really wants to do something they will do it no matter what happens, no matter what advice that you are going to give to her. They are the ones that would help themselves as well, if they really want to have that kind of characteristic, they should learn to limit first themselves and know what to prioritize.
I cannot say that it won't because we can still give them advice and the things they need to do to control their emotions but the problem is how they respond to the person who has taught them. Believing that every individual has their own decision and self upbringings if they close their minds into this advice and new market ideas, they are also closing the door to improve. A lot of people like these and actually they'll biting you back once they fail which is not our obligation to take care of them.