Scripture says:—If a man should rise, pretend to be a prophet, and show you his signs by which he desired to convince you that his words are true, know that God intends thereby to prove to the nations how firmly you believe in the truth of God's Word, and how well you have comprehended the true Essence of God; that you cannot be misled by any tempter to corrupt your faith in God. Your religion will then afford a guidance to all who seek the truth, and of all religions man will choose that which is so firmly established that it is not shaken by the performance of a miracle. For a miracle cannot prove that which is impossible; it is useful only as a confirmation of that which is possible, as we have explained in our Mishneh-torah.

Ch.24 - Guide for the Perplexed (c. 1190) - Part III