If energy isn't created or destroyed but simply changes, we have reason to believe it's the same with our being or our awareness. So we have also reason to believe that pain and suffering doesn't vanish after our so called death. Since we all have an individual pain threshold, it follows a collective pain threshold exists too that our collective awareness is subject to. That would be inclusive of all of us, since we came into being. So, its not unreasonable to suggest that on reaching that threshold we are impelled to change. Like an insurance policy in case we decide not to change direction earlier. So there's good reason to believe that change is inevitable.