But there is no such thing as a future-that-will-happen, only a set of possibilities for what might happen.
Unpredicted events can suddenly change the picture, blocking our path or opening up new and unanticipated paths.
These unpredictable events can be almost anything such as a natural disaster, an emergency, a new declaration by a leader, a new technology, or a chance meeting of a new person.
There is no fixed path—such as a plan would have you follow—to navigate through such uncertainty.