Gamble only becomes interesting when gambling responsibly. Risking the amount you can afford to lose will help a gambler not to become greedy and chase after losses.
I think the same thing, it was hard for me to adopt it, it was and sounds very easy, because one says it that way, but at the moment when I was playing I said that I was going to do it but at the beginning I couldn't do it, sometimes getting that discipline is difficult, it is hard because one feels bad, they are left with more desire to play and with more desire to do things better, so in part these things can be done to reaffirm that we are capable, that is why by controlling money we automatically control emotions, it is not easy, but when you control it you can apply this same strategy to trading.
A lot of gamblers allows their wealths control them that's why they can not make wise decisions all the time. Although some times it's easy to say but it's very hard to put to work. However, every disciplined gamblers can make good decisions most of the time and not allow greed and emotions control him/her when gambling. I like your quote actually because if one can control money it can be easy to control emotions when gambling. Control money will not make you chase lose or increase your stake. It can help to limit losses.