Everytime the human race gets closer to a break through in science or theology
The higher power, however you describe him/her ( I claim God), says, “Wait! Woops, uh no. Here’s a…” Now fill in that space with a natural disaster, a man made disaster, a change in global politics, a change in a political leader. It could be grand scale, local, global, your back yard. What if, these “oh my the world is going to end it’s the apocolypse” momemts, they were tests?
Have we ever stopped to look? Scary thought. And I leave on that note.