Optimism is something that must be maintained, I mean if we can lose even though we are optimistic at the beginning we will bet, especially if we are pessimistic from the beginning, because with an optimistic mind, we will be able to think well to make decisions, for example in sports betting we can carefully analyze before making a decision.
However, being optimistic does not mean that we can avoid defeat, because in gambling there are other factors that players do not know.