When the husband of my longtime friend and publishing colleague collapsed and later died, there was no doubt that life had slipped away from him. There were witnesses. The same was true when Jesus died. But three days later, Jesus was raised from the dead! We have no doubt that this is true because there were witnesses who later saw Him alive.
The repeated appearances of Jesus after His death and resurrection brought His followers so much joy that they must have wanted the visits to continue indefinitely. But on the 40th day after His resurrection, having given His disciples final instructions, Jesus slowly ascended and a cloud hid Him from view.