account too for the fact that all miracles have to do with events in the sublunar world and are not found in the relations and motions of the heavenly bodies. The case of Joshua causing the sun and moon to stand still is no exception. There was no standing stiU of the sun and moon in that case. What is meant by the expressions in Joshua 10 is that the Israehtes conquered the enemy in the short time that the sun occupied the zenith, whUe its motion was not noticeable for about an hour, as is usually the case about noon. In the case of Isaiah moving the sun ten degrees back for Hezekiah (Isai. 38, 8), there was likewise no change in the motion of the sun, but only in that of the cloud causing the shadow.
Miracles cannot be of regular occurrence, for if natural phenomena and laws were changed by miracle as a regular thing, it would signify a defect in the original order. Miracles cannot take place to violate the principle of contradiction, hence there can be no miracles in reference to mathematical truths, nor in matters relating to the past. Thus a miracle cannot make a thing black and white at the same time; nor a plane triangle whose angles are less than two right angles; nor is it possible by miracle now to make it not to have rained in Jerusalem yesterday, when as a matter of fact it did rain. For all these involve a denial of the logical law of contradiction that a thing cannot be and not be at the same time.358
A prophet is tested (1) by being able to foretell miracles before they come, and (2) by the realization of his prophetic messages. The question is raised concerning the statement of Jeremiah that one may be a true prophet and yet an evil prophecy may remain unfulfilled if the people repent. Does this mean that a good prophecy must always come true? In that case a good deal of what comes within the category of the possible and contingent becomes determined and necessary! The answer is that a good prophecy too sometimes fails of realization, as is illustrated in Jacob's fear of Esau after he was promised protection by God. But this happens more rarely on account of the fact that a man endeavors naturally to see a good prophecy realized, whereas he does his best to counteract an evil prophecy. 359
Gersonides's entire discussion of miracles shows a deep seated motive to minimize their extent and influence. The study of science and philosophy had the effect of planting in the minds of the mediæval
