I've asked a similar question lately. I had some insights but they might not please you. Because it boils down to an answer that i hated for years when religious folks gave me that one to every question in life. I think they were just to lazy to think further. Or i thought that they were just ignorant and "wanted to believe blindly in something" which may be true, but is by the way a good life skill regarding deliberately manifesting things.

So the answer is...drumroll please... "because God (Universe) knows everything" :).

But i will give you my thought process to this conclusion.

What is the Universe? It is everything...including you and me.

Who are you? Of course a part of the universe but more specifically you are 2 parts. You are your physical self and your higher self.

The you that you already know, the physical self lives here on earth on the ground with a physical body and with a physical brain. You know that one. You see that one every time in the mirror with your eyes. But you also have another part that lives above your physical self and watches all your physical life at a "mountain top" and gives you instructions what to do, how to act. That part knows how things will happen.

So let's say you want a car which would make you feel free, happy and independent when you drive it. Your higher self notices this and it knows how to give you that kind of car. But it also knows what would be even better for you because it sees everything better at the mountain top.

For instance it knows that a car like in your imagination would be cool. But it also knows that you forgot to think or visualize about lets say an aircon in that car, or some other fancy stuff. So it works in your best interest to give you more than you could ever imagine.

You only have to allow your higher self to do its work. But how? Simply by feeling (not necessarily vizualizing) free, happy and independent about having a car (a car, not a specific one) now.

Now you could ask: "Ok, but how does my higher self know what i want?"

Because your higher self is you and you are your higher self. And of course you and your higher self are the universe/god too. So ultimately you are the universe/god.

How couldn't the universe know? It is is you! How couldn't god know what he wants for himself?

So you see... god knows everything:).

I assume here that you are part of said universe, if so then how could it not know what your wants are?