Expectation is the root of all heartache.
This is also applicable to gambling. All of us aim to win but if we expect too much where in we fall for too much gambling just because of high expectations of winning, we will end up being broken financially and emotionally. We should always keep in mind that there's no guarantee of being victorious in gambling and we could only win by chances and luck.
I agree with this one, it sounds to soathing too, when your expectations are placed higher than you can reach, you may end up in a devastating state, financially, emotionally and otherwise.