Miracles are built into Nature

 Rabbeinu Bachya (Avos 05:08) What we learn from these medrashim is that everything – the past the present and the future has been decreed from the time of Creation and there is nothing new under the Sun. Thus what seems to be new is merely something built into Nature which is first manifesting itself at the appropriate time> Because if you want to say that G-d did not want something until it is seen and He is making something totally new and thus changing his Mind – Heaven Forfend! In fact there is no change or innovation in Nature after the original Creation and everything that seems to be a change was built into Nature. 

Moreh Nevuchim (02:29) God made an agreement with the sea that it should divide before the Israelites: thus it is said, “And the sea returned to its strength when the morning appeared”. R. Jeremiah, son of Elazar, said: Not only with the sea, but with all that has been created in the six days of the beginning was the agreement made: this is referred to in the words, “I, even my hands have stretched out the heavens, and all their host have I commanded”; i.e., I have commanded the sea to divide, the fire not to hurt Hananiah, Mishael, and Azariah, the lions not to harm Daniel, and the fish to spit out Jonah. The same is the case with the rest of the miracles. 

Avos (05:06) Ten things were created on the eve of the Sabbath at twilight, and these are they: [1] the mouth of the earth, [2] the mouth of the well, [3] the mouth of the donkey, [4] the rainbow, [5] the manna, [6] the staff [of Moses], [7] the shamir, [8] the letters, [9] the writing, [10] and the tablets. And some say: also the demons, the grave of Moses, and the ram of Abraham, our father. And some say: and also tongs, made with tongs.Avos D'Rabbi Nassan (36:5) These seven have no share in the World to Come: the scribe, the schoolteacher, the best doctors, the city judge, the magician, the sexton, and the butcher.

Moreh Nevuchim (02:29) Our Sages, however, said very strange things as regards miracles: they are found in Bereshis Rabba, and in Midrash Koheles, namely, that the miracles are to some extent also natural: for they say, when God created the Universe with its present physical properties, He made it part of these properties, that they should produce certain miracles at certain times, and the sign of a prophet consisted in the fact that God told him to declare when a certain thing will take place, but the thing itself was effected according to the fixed laws of Nature. If this is really the meaning of the passage referred to, it testifies to the greatness of the author, and shows that he held it to be impossible that there should be a change in the laws of Nature, or a change in the will of God as regards the physical properties of things after they have once been established. He therefore assumes, e.g., that God gave the waters the property of joining together, and of flowing in a downward direction, and of separating only at the time when the Egyptians were drowned, and only in a particular place. 

Rambam (Shemoneh Perakim 8) The sages said that all miracles which deviate from the natural course of events, whether they have already occured, or, according to promise, are to take place in the future, were fore-ordained by the Divine Will during the six days of creation, nature being then so constituted that those miracles which were to happen really did afterwards take place. Then, when such an occurence happened at its proper time, it may have been regarded as an absolute innovation, whereas in reality it was not. The Rabbis expatiate very much upon this subject in the Midrash Koheleth and in other writings, one of their statements in reference to this matter being, "Everything follows its natural course". In everything that they said, you will always find that the Rabbis avoided referring to the Divine Will as determining a particular event at a particular time. When, therefore, they said that man rises and sits down in accordance with the will of God, their meaning was that, when man was first created, his nature was so determined that rising up and sitting down were to be optional to him; but they as little meant that God wills at any special moment that man should or should not get up, as He determines at any given time that a certain stone should or should not fall to the ground. The sum and substance of the matter is, then, that thou shouldst believe that just as God willed that man should be upright in stature, broad-chested, and have fingers, likewise did He will that man should move or rest of his own accord, and that his actions should be such as his own free will dictates to him, without any outside influence or restraint, which fact God clearly states in the truthful Law, which elucidates this problem, when it says, "Behold, the man is become as one of us to know good and evil". The Targum, in paraphrasing this passage, explains the meaning of the words mimmenu lada'at ṭob wara'. Man has become the only being in the world who possesses a characteristic which no other being has in common with him. What is this characteristic? It is that by and of himself man can distinguish between good and evil, and do that which he pleases, with absolutely no restraint. Since, then, this is so, it would have even been possible for him to have stretched out his hand, and, taking of the tree of life, to have eaten of its fruit, and thus live forever. Since it is an essential characteristic of man's makeup that he should of his own free will act morally or immorally, doing just as he chooses, it becomes necessary to teach him the ways of righteousness, to command and exhort him, to punish and reward him according to his deserts. It behooves man also to accustom himself to the practice of good deeds, until he acquires the virtues corresponding to those good deeds; and, furthermore, to abstain from evil deeds so that he may eradicate the vices that may have taken root in him. Let him not suppose that his characteristics have reached such a state that they are no longer subject to change, for any one of them may be altered from the good to the bad, and vice versa; and, moreover, all in accordance with his own free will. To confirm this theory, we have mentioned all these facts concerning the observances and the transgressions of the Law.