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.