Either there is "a future" to know (or at least glimpse knowledge of) — and therefore our future is predetermined, or the future is unknowable and uncertain. Logically, you can't control your own destiny if the future is knowable.Either there is "a future" to know (or at least glimpse knowledge of) — and therefore our future is predetermined, or the future is unknowable and uncertain. Logically, you can't control your own destiny if the future is knowable.