Believe in the right belief?

How do you know what you believe in is the right thing? If there is a right and wrong standard, so to speak.

Sometimes i wonder if believing - in a set of beliefs/ a particular event that might result - over time might make you more stubborn or more determined? More stubborn- when you believe in something that would otherwise not happen. So can i say its a wrong belief? More determined- when you believe in something that might most probably result. So its a better choice?

Actually who is to judge, who is to say which is the right thing, the better choice? Life's yours, choices yours. The people around you can only illustrate to you what they see and what they think they conclude, its all to you to believe in yours or them when they do not strike a similar tone.

How about believing in your dreams?

I read in papers times and again that some people fork out money, make sacrifices to become an author (or other dreams that they have) because they believe in their dreams. But how long an author they remain? How long the dream last? It might be a moment of dream come true, yes they published their books, how about the response? Can they go on to their second book, their third.... their n book? Is it good enough just to see even if its one book on the shelves? How hard is it to go on... i dont have the answers...