To convince and to persuade them, he has only to will that they shall be convinced and persuaded. He has only to tell them things that are clear and sensible, things that may be demonstrated; and to evidence of such a kind they will not fail to give their assent. To do this, he will have no need either of miracles or interpreters; truth alone is sufficient to win mankind.
Supposing, nevertheless, the utility and possibility of these miracles, how shall I ascertain whether the wonderful operation which I see performed by the interpreter of the Deity be conformable or contrary to the laws of nature? Am I acquainted with all these laws? May not he who speaks to me in the name of the Lord execute by natural means, though to me unknown, those works which appear altogether extraordinary? How shall I assure myself that he does not deceive me? Does not my ignorance of the secrets and shifts of his art expose me to be the dupe of an able impostor, who might make use of the name of God to inspire me with respect, and to screen his deception? Thus his pretended miracles ought to make me suspect him, even though I were a witness of them; but how would the case stand, were these miracles said to have been performed some thousands of years before my existence? I shall be told that they were attested by a multitude of witnesses; but if I cannot trust to myself when a miracle is performing, how shall I have confidence in others, who may be either more ignorant or more stupid than myself, or who perhaps thought themselves interested in supporting by their testimony tales entirely destitute of reality?
If, on the contrary, I admit these miracles, what do they prove to me? Will they furnish me with a belief that God has made use of his omnipotence to convince me of things which are in direct opposition to the ideas I have formed of his essence, his nature, and his divine perfections? If I be persuaded that God is immutable, a miracle will not force me to believe that he is subject to change. If I be convinced that God is just and good, a miracle will never be sufficient to persuade me that he is unjust and wicked. If I possess an idea of his wisdom, all the miracles in the world would not persuade me that God would act like a madman. Shall I be told that he would consent to perform miracles that destroy his divinity, or that are proper only to erase from the minds of men the ideas which they ought to entertain of his infinite perfections? This, however, is what would happen were God himself to perform, or to grant the power of performing, miracles in favor of a particular revelation. He would, in that case, derange the course of nature, to teach the world that he is capricious, partial, unjust, and cruel; he would make use of his omnipotence purposely to convince us that his goodness was insufficient for the welfare of his creatures; he would make a vain parade of his power, to hide his inability to convince mankind by a single act of his will. In short, he would interfere with the eternal and immutable laws of nature, to show us that he is subject to change, and to announce to mankind some important news, which they had hitherto been destitute of, notwithstanding all his goodness.