In this world, a person sees but through a glass, darkly. He catches a few brief excerpts of reality, mere flashes of the way the Creator runs His creation. The rest is night. With only the few chapters of world history at our disposal we can't visualize the whole of existence - from where it comes and to where it's going. That's why this world is like night.
Distance lends perspective and comprehension.
Next time you're in shul , take a look at the Ten Commandments above the Ark. The tops of the two Tablets are curved. The Talmud describes the Tablets as being cubes. There is not a single classical Jewish source which describes the Tablets in the form with which we are familiar today. When the Ten Commandments were engraved on the Tablets, they were also being engraved on the hearts of the Jewish People for all time.