As long as you as an individual... can convince yourself that in order to move forward as best you can you have to be optimistic, you can be described as 'one of the faithful,' one of those people who can say, 'Well, look, something's going to happen! Let's just keep trying. Let's not give up.
Finally there are simple ideas of which no definition can be given; there are also axioms or postulates, or in a word primary principles, which cannot be proved and have no need of proof.
I've seen the odd tarot reader and had my palm read in various countries and explained to me in many strains of broken English. Did I believe a word? To be honest, I didn't understand much, but I loved watching the presentation.