Moses raised his arm over the sea. G-d drove back the sea throughout the night with a powerful east wind and turned the sea into dry land, and in addition, the waters all over the world split, so the whole world would know of this miracle.
And G-d drove back the seas throughout the night with a powerful east wind: In other words, G-d had to keep the wind constantly blowing in order to keep the walls of water erect. Had G-d let the wind stop, these walls would have collapsed and the sea would have reverted to its natural level.
When G-d created the world, He also acted against the "natural" state of things: He created existence out of non-existence. Analogous to the Splitting of the Sea, G-d has to keep His creative force constantly "blowing" into reality in order to keep it from reverting back to its original, default state of non-existence. Reality is therefore not something that exists by virtue of the existential property with which G-d imbued it when He first created it. It continues to exist solely because G-d is actively and continuously infusing it with His creative force.
The implications of this truth are both profound and far-reaching. If G-d is constantly recreating the world, then the world right now is, in a very real sense, an entirely different one than the world that existed a moment ago. It is a fresh, new world, and we are brand-new people, not necessarily straitjacketed by any cause-and-effect relationship with the past. We have complete freedom to choose between good and evil at any given moment, unencumbered by precedent or habit.