Are There Questions We Can’t Ask Because the Answers Cannot be Known?

The question we are asking is a question of metaphysics, which concerns our understanding of the concept of truth. If a question can be asked, one of the things which follows from that is that we can grasp what it would mean for that question to have an answer. Of course, not all questions which have answers, are questions we can answer. For example, most people would agree that the question how many times I clicked the mouse today has an answer, but if I am not running a program on my computer which counts mouse clicks, then barring total recall there is no way I can discover what that answer is. I can ask the question, but I cannot answer it.

But now consider the question: ‘Has there ever been, in the history of the universe, a period of time during which absolutely nothing happened?’ In other words, can there be such a thing as an empty time? If you allow that there might, sometimes, occur periods of empty time, then it follows that it is logically possible that in between each key tap as I write these words, the universe stops still for a million years. There is a case for saying that because we cannot conceive of what it would be to 'know' that an empty time has ever occurred, that is one question we cannot even ask.