An open miracle is somewhat of a disappointment for G d.
Once all is said and done, He got His way only by ignoring the norms of this world He created—by breaking His own rules. If He can only perform miracles by bullying Nature, He may as well concede that our world is a place where He does not belong…
So He also makes another sort of miracle—the sort that blends seamlessly into the order of things below. These are impossible miracles: They break no rules, but change everything. We can them nature.
In truth, they are the most awesome of miracles—these that reveal the Infinite unrestrained within the finite nature of everyday things.
Chabad.org and Menachem Mendel Bluming