How can we be sure that a good message is necessarily from God?

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The logical and sublime nature of the content of a speech is not necessarily proof that it comes from God; because it's possible that a good and correct word is falsely or mistakenly attributed to God. However, the same process that made us certain about the logic of a subject can be effective in trusting the divinity of a message too.

Although distinguishing right from wrong must be based on criteria like reasoning and the convention of rational people, ultimately it is the person himself who feels the rationality and irrationality and goodness and badness of everything in his thought and heart. Therefore, sometimes a specific argument is convincing for some people and ineffective and sterile for another group.

Our situation in confronting the claim of prophets is like a place where we want to judge about the correctness or error of a proposition that has no evidence other than conscience. In such a situation, each person finds within himself a call that he can name inspiration and God's message and as long as there is no evidence to the contrary, respects it.

Of course, evidence like a reliable introducer, miracle, fulfilled prophecy or knowledge beyond time can strengthen and confirm this feeling; but even in the absence of such signs, each person has the right and even duty if he encounters a message whose beauty and nobility he recognizes at the level of God's conscience messages, to believe in it.