Don't be too aggressive in gambling, nor live with too much confidence, because no matter how positive we are, this won't make us win. All we need is luck, not this stuff, especially in pure luck-based games.
We have to remind ourselves that this is gambling. Not all who have a winning mindset will win; they even lose more. And sometimes we have to quit if necessary. Different from others, like in business, where being positive could help to get better.
Another example is those poor people who keep gambling, thinking they could win and become rich. Unfortunately, they become poorer.