I dont know whether this is an unwritten law or not but I have come to see that Positive thinking does leads to positive results and this is not only applied in gambling alone but almost every thing on this earth.q
Yes, but you can't rely on that every single time, positive thinking might come to its limit where it could disappoint you from time to time, to avoid this, think positive but don't expect too much. Just like what other people says, the house won't let you win as always, so thinking a way on how to win on gambling is nonsense in some ways.
Being positive is a good thing but don't expect to win in your bet because of being positive,winning in gambling is only depends on the luck and probability.Positive thinking will make our mind clear so which may give better mind to select the right games to play which may increase our winning chance but there is no way which can give as 100%winning in gambling.