Patience and not greedy are two important things that I always hold and although it is difficult to start but this is important to learn because these two important things we need to apply in life and maybe not only in gambling but wherever we are. Gambling is more at risk of loss and if someone does not have emotional control, they will never succeed in controlling themselves and as a result they are trapped in uncertain situations.
Feeling enough whatever victory we get is a good start to control emotions and never pursue something uncertain in gambling. Conversely it is also important to train ourselves to stop when experiencing losses so that we do not create new problems in betting.
I agree to that, being contented with what you've got and taking advantage if opportunities open to win some from your gambling activities, there's always a good outcome when you know when to stop if it's needed, experienced gamblers understand that it's not usual to win that's why they are able to quit and enjoy, while those who got greedy those gamblers risk everything back as they can't control that desire to win more.
That's how a gambler should have a mentality, being satisfied with any amount of winnings is indeed an attitude that is recommended for a gambler to have because it can really help them to stop at the right time and if we talk about experienced gamblers one of the reasons why they are quite easy to stop at the right time is because they clearly already know about what is likely to happen when they don't stop at that time. This means that greedy gamblers are most likely beginners who are still obsessed with winning, who don't have much experience and also those who don't understand what and how the concept of winning and losing in this activity actually is.