a well disciplined mind can still gamble comfortably without having to chase his or her losses, even in the middle of losses, it all boils down to your main reason for gambling, are you gambling just to have fun or is your reason for gambling is you trying to see if you can make some money in through it?.
For someone whos motive for gambling is to have fun, losses is not a problem is he or she must before engaging in that session consider the money being spent lost, but for that person who is looking to make some profit out of that gambling session, yeah, if the profit aren't coming but you are just losing money, then its good to back off and try again later.
True, however even for gamblers that are just looking to obtain some fun they still need to plan accordingly, especially when it comes to the size of their bets and the bet progressions they want to use, as even if their intention is to have fun, how fun it can be to lose all your money you had available for that session in a matter of minutes? Then it is important to make a plan, that way if we happen to lose many times in a row we will still have enough capital to reach our goal of having some fun while we gamble.