I may have totally misunderstood your question but my exegesis of your words leads me to this conclusion.
I think what you are asking is very metaphysical, but cannot be considered off-topic for it delves into the deepest meaning of hermeneutics. I think the questions is actually saying, ‘How can anyone understand what another person is saying, and once defined how can we in the same way understand what the Bible is saying.’ It necessarily leads into dividing the literal from the figurative, for if we do not do that, we cannot understand anyone speaking about anything.
Without getting too philosophical, I think God made out minds to naturally tell the difference, but when reading from another culture or even a translation from another language we need some extra help, sometimes. This is where Biblical scholars help us.
From a basic standpoint, I think if we understand anyone to be saying something ridiculous, contradictory, illogical, or stylized in a weird way, we naturally start to try to logically connect things figuratively, until we have a logical ‘possible’ understanding.
Conclusion: God gave our minds the ability to interpret with an innate and largely indefinable set of rules. Reason under the Holy Spirit is highly effective at convincing men of the truth, and even overpowering those who are disposed to an extreme bias against it. There is a God given, Spirit involved, natural hermeneutic, that believers use to understand the Bible. Reason will also argue that disciplined study that includes some critical thinking, study of history and culture, etc. is sometimes required to fully gain a confident interpretation of any portion of the Bible.
What I am trying to say from a Biblical perspective is:
12“I have much more to say to you, more than you can now bear. 13But when he, the Spirit of truth, comes, he will guide you into all truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come. 14He will bring glory to me by taking from what is mine and making it known to you. 15All that belongs to the Father is mine. That is why I said the Spirit will take from what is mine and make it known to you. (John 16:13)
Then by these means,once somthething is considered literal, as
Jon suggested above, 'anything phrased as an imperative or command to the reader would create such a demand'. Also anything figurative that would imply an imperative or command would do the same.