Do you believe in destiny?
Do we have a completely free choice, or is life locked in advance to a specific chain of events?
Many people in the world believe in destiny. Probably more than those who don't, although I don't have any numbers on it.
Don't have to either, because as the sentence implies, it's a matter of belief, so I'm perfectly fine leaving it at that. It's an individual choice.
Such a belief doesn't come out of nowhere, though. It comes out of thousands of years of experience with life. Whether we like it as rational thinkers or not, there is some truth to not having full control over life.