G-d Can Alter Nature but Generally Doesn't

 Ramchal (Derech Hashem (02:06.06) Regarding miracles: But note that He changes the rules of creation according to His will at any time that He wants; and He does miracles and wonders with different things as He desires. He does this as He decrees that it will be proper for the purpose of creation according to the situation or according to the time. So what is this that the Sages said, "G-d made conditions with all of the work of creation."? It is not that G-d would not change anything from now on. For He could certainly make a complete change any time He wants. Rather the matter is that at the time of the creation, He showed and informed all of the roots of the creatures their functions, the truth of their existence, the purpose of their creation, what they would effect in the future with their processes and what would be the end of their functions. And they grasped and knew that all was going to be for the purpose of the true good. And they accepted the thing and rejoiced in it. And this is the meaning of that which the Sages said in a homiletical teaching, "All the works of creation were created with their consent." However when G-d informed them of their true function and laws and the truth of all the processes, He also showed them that those miracles that would be performed upon them for Israel or for the righteous among them at certain times were from among the things that were needed for their perfection. Of course, this thing was [first] stated to the roots of the higher ones and afterwards unfolded down; and [then] the things were established in the physical realm as is fitting for them. And appointees were placed over them that strengthen them in their natural law. However at the time that G-d wants, He decrees over His appointees and they stop their assignment and change their natural process, due to the decree that was upon them. And it is actually possible that the decrees coming to them be in different ways. The explanation of this is that it comes - by way of example - like the command of a king or like the rebuke of a furious governor, as the matter is stated, "And He rebuked the Red Sea, and it dried, etc." Likewise that which is similar to this among the ways; everything according to the situation and its time.